Language：English   Publishing type：Research paper (scientific journal)  

One of the problems relating to frost formation in the field of aviation is the effects of Cold Soaked Frost. It is hazardous problem for which various solutions are the responsibility of several aviation administrations. Owing to the lack of computational research on frost formation such as on a wing surface, an advanced model for predicting frost thickness under a various range of flow conditions was developed and validated in this study. In evaluating the growth rate of the solid layer, the relation between the partial vapor pressure and the saturation pressure was used to determine the supersaturation degree. Frost thickness was assumed on the basis that the mass transfer effects associated with the diffusivity of the vapor are related mainly to the growth rate of crystallization. We performed a favorable regression procedure to find constant values for the correlation of the growth rate. The proposed frost thickness model was validated through the comparison of the simulation results with various experimental data for the case of a flat plate. The results obtained using the proposed model agree satisfactorily with the experimental data.

DOI： 10.1007/s42405-022-00464-5

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1088/1361-6463/abe746

Other Link： https://iopscience.iop.org/article/10.1088/1361-6463/abe746

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/19942060.2018.1453381

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.5010713

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2514/6.2017-3308

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3938/jkps.68.1295

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2514/1.T4130

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1088/1009-0630/16/10/06

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2514/1.T3991

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.proeng.2013.12.025

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1615/ComputThermalScien.2012004762

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1088/0022-3727/43/18/185201

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2514/1.13603

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jweia.2005.09.003

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s11630-003-0032-x

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s001930200135

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (bulletin of university, research institution)  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12 - 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

The radio-frequency blackout, which is the communication cutoff between a reentry vehicle and ground station during the atmospheric reentry, has been observed for many missions. Aerodynamic heating caused by a strong shock wave in front of the reentry vehicle dissociates and ionizes the gas. This plasma can block the propagation of electromagnetic waves emitted from the antenna on the vehicle. To mitigate the communication blackout, it is significant to reduce the electron number density near the reentry vehicle. We focused on a new mitigation scheme by film cooling approach. Cold gas injected from the vehicle’s surface forms a thin heat-insulating air film layer where electromagnetic waves can propagate because of the low degree of ionization. In this study, we investigated the effects of the air film for the blackout mitigation using a communication test and computational fluid dynamics (CFD) approach for flow field in the large-scale arc-heated wind tunnel. The communication test results and the computed results indicated that gas the air film forms a propagation path of the electromagnetic waves.

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

A longitudinal vortex appears in many kinds of flow fields of engineering interest and is known to give large influence on the performance of fluid machinery. Therefore, it is important to study how vortex structures interact with each other. In this study, the interaction of unsteady longitudinal vortices under various conditions was investigated numerically. We considered a wing tip vortex generated on an airfoil, and made it interact with a longitudinal vortex generated from a flat plate with several patterns of unsteady motions. From the computational results, we investigated how the introduced vortex from the flat plate affected the wing tip vortex, and consequently the lift and drag coefficients.

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

The radio frequency blackout that occurs during a spacecraft re-entry is a complicated phenomenon that is not well understood, and more detailed studies are thus neccesary. In this paper, a numerical study of flow fields around a test model in an arc-heated wind tunnel was performed. Furthermore, the electromagnetic field simulation using a frequency dependent finite difference time domain (FD2TD) method was also performed to clarify the behavior of radio waves. To discuss the validity and further improvement of the simulation, the model was placed with an inclined angle from the nozzle exit, as well as in a straight line. The obtained results are compared with some experimental data.

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Recently, from a viewpoint of CO2 reduction and energy saving, further reduction of fuel consumption for automobiles has become more and more important. For this purpose, reducing the air resistance of a vehicle body is essential because it is much larger than the other road resistances in high-speed driving. Around a vehicle body, various unsteady vortex structures are generated, and their control is known to be important for the aerodynamic performance. In this study, to investigate the vortex structures in more detail, we analyzed simulation results of a flow field around the Ahmed body using Snapshot Proper Orthogonal Decomposition (SPOD) considering frequency characteristics in each mode. Particularly, we adopted two types of flow variables, i.e., velocity and vorticity, in creating the expansion coefficients of POD, and the obtained results were compared to find difference in their features.

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Sweeping jet (SWJ) actuator was introduced to an axisymmetric bump model with the aim to control transonic turbulent boundary-layer separation. Three-dimensional unsteady Reynolds-averaged Navier-Stokes (RANS) simulation was used to investigate the flow control performance of SWJ Actuator with different momentum coefficient. Furthermore, we conducted numerical analysis of a steady jet actuator as another flow control device, and then discussed advantage of SWJ Actuator.

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

To predict the radio-frequency blackout precisely, an accurate estimation of the electron number density is indispensable. However, its prediction in our numerical analysis system had been considerably overestimated. In this study, we tried to improve the prediction accuracy of the electron number density of a plasma flow in an arc-heated wind tunnel. In particular, we investigated the sensitivity of several simulation factors on the prediction of the electron number density, e.g., chemical-reaction parameters and Joule-heating conditions.

Event date： 2020.12 - 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Recently, from a viewpoint of CO2 reduction and energy saving, further reduction of fuel consumption for automobiles has become more and more important. For this purpose, reducing the air resistance of a vehicle body is essential because it is much larger than the other road resistances in high-speed driving. Around a vehicle body, various unsteady vortex structures are generated, and their control is known to be important for the aerodynamic performance. However, these structures are very complex and thus it is difficult to elucidate their essential features. In this study, to investigate the vortex structures in more detail, we performed flow computations of a channel flow and the obtained results were analyzed using Snapshot Proper Orthogonal Decomposition (SPOD) considering frequency characteristics in each mode.

Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

The consideration of turbulence is essential for investigating a high Reynolds number flow field, such as that around an aircraft or a automobile. Owing to the development of super computers, computational fluid dynamics (CFD) has become more and more useful for understanding such complex flow phenomena. Although large eddy
simulation (LES) is promising among CFD strategies, its computational cost is still problematic. To reduce the computational cost of LES, the development of a sub-grid scale (SGS) model is indispensable. In this study, a regression of SGS stresses is performed using machine learning (ML). For the present ML, highly-resolved LES data of a plane channel flow are adopted as a teacher dataset, and the results obtained from the regression are carefully investigated by comparison with the target data.

Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宇宙科学研究所(相模原市）   Country：Japan  

触媒性再結合反応による通信ブラックアウトの低減化が数値的に実証されている．アーク加熱風洞を用いて低減化を実験的に実証するため，ISAS 1MWアーク加熱風洞において通信実験を実施した.低触媒材料であるセラミックのケースでは通信ブラックアウトが生じたのに対し，高触媒材料である銅のケースでは生じなかった．この結果は触媒効果による通信ブラックアウト低減化実証を示唆するものである．

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Reentry blackout during the atmospheric reentry interrupts communication between the reentry vehicle and ground stations. To improve safety during reentry, a mitigation method using the surface catalysis effect was proposed. An experimental test of this method using the arc-heated wind tunnel was performed. However, its mechanism is not clear. In this study, we numerically simulated plasma flows in the ISAS 1MW arc-heated wind tunnel and around the atmospheric reentry demonstrator (ARD). Computed results for the non-catalytic and finite-catalytic wall conditions were compared with each analysis. The results showed that the dominant chemical reaction to reentry blackout was the electron-impact ionization. The mitigation mechanism was clarified as follows: 1) the amount of nitrogen and oxygen atoms decreased because of the catalyst; 2) reverse reactions of the electron impact ionization occurred to increase the number of nitrogen and oxygen atoms due to the decrease in atoms; 3) These reverse reactions consumed electrons and thus the reentry blackout was mitigated. It was found that these mechanisms were in common, despite the different airflow conditions between the arc-heated wind tunnel and atmospheric reentry.

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸大学(神戸市)   Country：Japan  

Event date： 2020.3

Language：Japanese  

Venue：神戸大学(神戸市）   Country：Japan  

Event date： 2020.2

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜国立大学   Country：Japan  

Numerical simulation of plasma flow around a probe in an arc-heated wind tunnel was performed by using flow field simulation. Plasma parameters necessary for electromagnetic wave analysis were obtained. Electromagnetic wave analysis was performed using frequency dependent finite difference time domain (FD2TD) method. Compared with the experimental results, it was found that the analysis result greatly estimates the attenuation of electromagnetic waves. Parametric study on diffusion coefficient of electrons showed that diffusion coefficient of electrons greatly affects communication possibility

Event date： 2018.12

Language：Japanese  

Venue：機械振興会館   Country：Japan  

Event date： 2018.12

Language：Japanese  

Venue：機械振興会館   Country：Japan  

Event date： 2018.12

Language：Japanese  

Venue：機械振興会館   Country：Japan  

Event date： 2018.12

Language：Japanese  

Venue：機械振興会館   Country：Japan  

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学伊都キャンパス   Country：Japan  

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：久留米シティプラザ   Country：Japan  

The radio frequency blackout that occurs when a spacecraft reentry was reproduced in experiments using an arc heated wind tunnel. A ϕ50 probe that is cooled by water and a radio transmitter installed was setting in the arc heated flow, and a radio receiver was setting up outside of tunnel chamber. The blackout was confirmed as the communication stoppage between the transmitter and the receiver. Additionally, Three dimensional flow field around the probe with radio transmitter located in the arc heated wind tunnel was simulated by numerical simulation. The result of numerical simulation agrees with the experimental result that showed radio frequency blackout. Comparing the results of experiments and simulation makes it possible to improve the accuracy of numerical simulation of the radio frequency blackout.

Event date： 2018.6

Language：English  

Country：United States  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学   Country：Japan  

Using a three-dimensional model considering an angle of attack and catalytic reaction of surface, numerical simulations of plasma flow and electromagnetic waves around an atmospheric reentry demonstrator (ARD) were performed. The comparison of the distributions of flow-field properties was obtained between the non-catalytic wall and the finite-catalytic wall model. The comparison of the results of two models, it was shown that wall condition has strong influence on the distribution of electron number density in the wake region of a vehicle. A frequency-dependent finite-difference time-domain (FD2TD) method was adopted as numerical simulation method of electromagnetic waves, and properties of plasma around a vehicle, which were obtained by the simulation of flows around the vehicle with strong shock wave. The behaviors of electromagnetic waves around a vehicle were evaluated. Moreover, the numerical results of plasma attenuation were compared with those of an experiment between the ARD and a data relay satellite to evaluate the predictive performance of surface catalytic models.

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都工芸繊維大学   Country：Japan  

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都工芸繊維大学   Country：Japan  

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都工芸繊維大学   Country：Japan  

Event date： 2017.6

Language：English  

Country：United States  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神奈川県横須賀市　ヴェルクよこすか   Country：Japan  

Three-dimensional simulation for flow fields in an arc-heated wind tunnel was developed and numerical simulation of a flow field around a columnar test piece was performed. The results were compared with those by an axisymmetric calculation. Comparison of these two cases enabled us to investigate the detailed distributions of the flow-field properties. It was clarified that the calculation of the three-dimensional model provided predictions quite similar to those of the axisymmetric calculation and thus the present code worked reasonably. In addition, it measured heat flux using the probe to have made it have an angle of attack to the arc flow to emphasize a three-dimensional effect and compered with the simulation.

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都江戸川区　　タワーホール船堀   Country：Japan  

These days it is important to　protect　environmental　by　global　warming.　Since　the　low　mileage　becomes　important　to　car　development.
The other hand, in late years, computational fluid dynamics (CFD) become used for car development by the progress of the computer engineering.　However, a cost reduction to get enough predictability is still problem. Also we need the lattice point of hundreds of millions for CFD. Therefore, in this study, it applies an anisotropy resolving SGS model that developed by Abe in 2005. We took good agreement in Cd between CFD and Experiment by using fillet tire. However, disagreement of flow under floor and side wall flow were seen in distributions of total Cp.

Event date： 2016.12

Language：Japanese  

Venue：東京都江戸川区　　タワーホール船堀   Country：Japan  

Three-dimensional simulation　for flow field in an arc-heated wind tunnel was developed and numerical simulation of the flow field around a columnar test piece was performed with axisymmetric and three-dimensional model. Using the flow field simulation of two models, the detailed distributions of flow field properties were obtained. From comparing the results of two models, it was clarified that three-dimensional model secure about the same accuracy as axisymmetric model.

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：熊本大学   Country：Japan  

Using an axisymmetric model and a three-dimensional model considering an angle of attack, numerical simulations of plasma flow and electromagnetic waves around an atmospheric reentry demonstrator (ARD) were performed.

Event date： 2015.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2015.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2015.9

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：English  

Country：Bosnia and Herzegovina  

Event date： 2014.11 - 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学　伊都キャンパス   Country：Japan  

本研究室にて開発した乱流の異方性を考慮した付加項をLESのサブグリッドスケールモデルに付加することによりより負荷の小さい方法で高い予測精度を保つ計算ができることを示した．

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本電機大学北千住キャンパス   Country：Japan  

アーク加熱風洞気流中において供試体周りの分光計測を行う場合に供試体側方から計測することが一般的であるが．模型内部から衝撃波背後の発光の様子を取得しようとしたところ，側方からと正面からで大きく異なった結果が得られた．そこでこの現象について報告すると共に，その原因について議論する．
特に違いの分かる窒素流について観測を行った．
特に側方からの観測では分子からのスペクトルが中心で観測されるが，正面からの観測では分子からの発光は非常に弱く，ほとんどが原子からの発光であった．その上ノズル中心軸における正面からの観測では，窒素原子イオンからの発光がほとんどであるが，中心軸を若干ずらし，放電を起こしている場所，陽光柱を直接観測的ない状態でデータを取得すると，窒素の中性原子からの発光が中心となった．このことから予想がつくことは，発生しているプラズマにおいて光学的な厚さが薄く，正面からの観測においてはほとんどノズル内部からの発光を捉えており，プローブ前方に発生している衝撃波背後の発光は相対的に非常に弱いことが分かった．
このことにより，ノズルスロートを観測することにより，放電の状態を捉えることができる可能性が示唆された．

Event date： 2014.6

Language：English   Presentation type：Oral presentation (general)  

Country：China  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.9

Language：Japanese  

Venue：岡山大学   Country：Japan  

When we produce a thermal protection system (TPS) for the space vehicle entering a planet, the arc-heated wind tunnel is used widely. The arc-heated flow is very complicated. In addition, we assume the on-board measurement of spectroscopy to understand the flow properties of very strong shock-heated gas. Present work show a method of head-on measurement of spectroscopy used optical fiber in high-enthalpy gas. At first, the head-on measurement of spectroscopy and side-on measurement were compared. At argon flow, the electronic excited temperature has 500 K difference between these two methods. At the nitrogen flow, in the case of the head-on, it could see only the spectrum from nitrogen atom. The light weight ablator (like PICA) materials was used as TPS. The head-on measurement could operate over the 10 seconds for light weight ablator. In addition, the time resolved measurement of spectroscopy caught the change of the property of spectrum.

Event date： 2013.6

Language：English  

Other Link： www.me.ust.hk/~ascht13

Event date： 2013.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

We propose a new Hybrid LES/RANS Model (HLR) which combines large eddy simulation (LES) with the Reynolds-averaged Navier-Stokes (RANS) equation with the aide of an anisotropy-resolving subgrid-scale (SGS) model based on a scale-similarity model 4). We find that the introduction of an SGS anisotropic term give a reasonable influence on the transition between RANS and LES. To investigate the model performance, the proposed model is applied to fully-developed plane channel flows with various grid resolutions and at several Reynolds numbers. For further investigation, we apply the present model to high Reynolds-number complex turbulent flows of practical interest. The Ahmed body with the 25° angle of the rear slant which the Reynolds number based on length of is Re=2.78×10⁶ is selected for verification of the present model. For the flow structure, the result of HLR model shows similar to that of experiment in coarse and fine grid. The value of the friction drag coefficient of HLR model has a smaller the grid dependence than that of LES and corresponds to that of experimental. However, the pressure drag is underestimated. As the result, the drag coefficient of Ahmed body is underestimated.

Event date： 2013.5

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Other Link： http://2013apcats.me.nctu.edu.tw/

Event date： 2013.5

Language：English   Presentation type：Oral presentation (general)  

Country：China  

Other Link： http://www.isaif11.org

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場   Country：Japan  

アーク加熱風洞での軽量アブレータの加熱試験の様子をより再現するために軽量アブレータの特徴である内部の流れを様子を温度による透過率変化をパラメータの一つとして導入することにより高精度な数値シミュレーションを外部の流れとともにカップリングさせて行いこの取り扱いの必要性を明らかにした．

Event date： 2013.1 - 2013.2

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Country：Japan  

Event date： 2012.11

Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

HAYABUSA再突入カプセルの超軌道からの再突入時の機体周りの流れ場と熱伝達及びアブレータ内部の熱応答の弱カップリング計算を行った．この計算においては衝撃波層からの輻射についても3-bandモデルを非平衡流に拡張することによりカップリングも行っている．この輻射モデルは非常に計算コストが低くかつ精度が高く維持することができた．この研究ではアブレータの厚さが十分であることも確認された．

Event date： 2012.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学   Country：Japan  

Hayabusa再突入カプセルの再突入環境をモデルにとり，熱防御システムとして近年開発が進んでいる軽量アブレータを用いた場合どのようになるか，また，従来のアブレータとどのような違いが出て何に注意しながら耐熱設計をしなければならないかを論じた．

Event date： 2012.9

Presentation type：Oral presentation (general)  

Venue：金沢大学   Country：Japan  

Event date： 2012.3 - 2012.5

Presentation type：Oral presentation (general)  

Venue：千葉県　柏市   Country：Japan  

Thermal-response analysis and an arc-heated wind tunnel experiment were carried out to study the effect of the pyrolysis gas flow inside the heating ablator. The analysis treated the heating process of arc-heater and the thermal-response analysis code included heat conduction, pyrolysis of resin, pyrolysis gas flow, and surface recession due to chemical reactions. In this study, the pyrolysis gas flow was treated as the multi-dimensional (axisymmetric) and unsteady phenomenon. This computation showed that the detailed analysis considering the multi-dimensional pyrolysis-gas flow and the flow injection of pyrolysis gas led to improvement of the predictive performance for the ablator thermal response.
In addition, the temperature measurements inside and surface of the light-weight ablator were carried out. It was used two type ablator in this experiment. As for one, surfaces were coated and the other was non-coated.

Event date： 2012.1

Language：English  

Country：United States  

Event date： 2011.12

Presentation type：Oral presentation (general)  

Venue：神奈川県　相模原市   Country：Japan  

HAYABUSA再突入カプセルの超軌道からの再突入時の機体周りの流れ場と熱伝達及びアブレータ内部の熱応答の弱カップリング計算を行った．この計算においては衝撃波層からの輻射についても3-bandモデルを非平衡流に拡張することによりカップリングも行っている．この輻射モデルは非常に計算コストが低くかつ精度が高く維持することができた．この研究ではアブレータの厚さが十分であることも確認された．

Event date： 2011.9

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.6

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Venue：青山学院大学相模原キャンパス   Country：Japan  

Event date： 2010.12 - 2011.12

Presentation type：Oral presentation (general)  

Venue：宇宙科学研究所   Country：Japan  

Event date： 2010.12

Presentation type：Oral presentation (general)  

Venue：宇宙科学研究所   Country：Japan  

Event date： 2010.11

Presentation type：Oral presentation (general)  

Venue：九州大学伊都キャンパス   Country：Japan  

Event date： 2010.11

Presentation type：Oral presentation (general)  

Venue：九州大学伊都キャンパス   Country：Japan  

Event date： 2010.9 - 2010.10

Language：English  

Country：Czech Republic  

Event date： 2010.9 - 2010.10

Presentation type：Oral presentation (general)  

Country：Czech Republic  

Event date： 2010.9

Language：English  

Country：France  

Event date： 2010.9 - 2009.9

Presentation type：Oral presentation (general)  

Venue：名古屋工業大学   Country：Japan  

Event date： 2010.3

Presentation type：Oral presentation (general)  

Venue：埼玉大学   Country：Japan  

Event date： 2010.3

Presentation type：Oral presentation (general)  

Venue：埼玉大学   Country：Japan  

Event date： 2009.12 - 2010.12

Presentation type：Oral presentation (general)  

Venue：宇宙科学研究所   Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Venue：宇宙科学研究所   Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Venue：北九州市コンベンションセンター   Country：Japan  

Event date： 2009.11

Presentation type：Oral presentation (general)  

Country：China  

Event date： 2009.10

Presentation type：Oral presentation (general)  

Country：Korea, Republic of  

Event date： 2009.9

Presentation type：Oral presentation (general)  

Country：France  

Event date： 2009.9

Presentation type：Oral presentation (general)  

Venue：岩手大学   Country：Japan  

Event date： 2009.7

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.6

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008.7

Language：English  

Country：Japan  

Event date： 2008.3

Presentation type：Oral presentation (general)  

Venue：東京都目黒区   Country：Japan  

Event date： 2008.3

Presentation type：Oral presentation (general)  

Venue：東京都目黒区   Country：Japan  

Event date： 2007.12

Presentation type：Oral presentation (general)  

Country：Japan  

Numerical Simulation of Plasma Flows in a 20kW Arc-heated Wind Tunnel Using Multi-temperature Model

Event date： 2007.3

Presentation type：Oral presentation (general)  

Venue：福岡県春日市   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：大阪   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学東山キャンパス   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学東山キャンパス   Country：Japan  

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：1,000

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：800

Type：Competition, symposium, etc.