混相現象の数値的・実験的解明を目指す

孫研究室では、気体、液体、固体の混相媒体中の衝撃波現象に関する、地球科学、産業分野に亘る学際的研究及び応用を行っています。従来の数値的及び実験的手法をさらに発展させた次世代融合手法を用いて、学際及び応用研究を強力に推進しています。

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現在進行中の主な研究テーマ

これまでの主な研究テーマ

    • バーチャル衝撃波管の構築へ:くさびを過ぎる衝撃波
    • 軸対称流れにおける影写真・シュリーレン写真の生成
    • 可視化光学系作成を補助する解析・設計技術の開発
    • 火山噴火を模擬した数値シミュレーション
    • キャビテーション現象の数値的および実験的解明及び解析
    • レーザー誘起気泡の挙動に関する数値的解析
    • 水中気泡の拡大可視化および挙動に関する研究
    • バーチャル風洞の構築へ:翼型NACA0012周りの流れ
    • 極低温環境下における高速衝突現象の解明

 

Interdisciplinary Shock Wave Laboratory is devoted to research on fluid flows, especially the flows accompanied by shock waves, using numerical and experimental techniques. Current research subjects include

・To develop an exactly conservative numerical method for the simulation of compressible multiphase phenomenon containing ANY sized bubbles. Practical applications on hand include laser-induced bubble phenomenon, volcano eruption, supersonic jet formation by impact acceleration method, and hypersonic water entry phenomenon. We have made a breakthrough on this task recently, see the movie below. Bubble(s) collapsing after shock wave loading has been resolved on a very coarse grid. Most important features are successfully resolved. An interface is resolved roughly within one grid cell. A sub-grid size bubble can be simulated as well, even after its rebound. The computation took only a few minutes on a PC computer. The technique allows us to perform more challenging computations that have never been tried, such as direct simulation of volcano eruption.

・To develop a computer-aided technique to analyze optical setups, such as shadowgraph method and schlieren method, by combining CFD and ray tracing method.

・To develop integrated CFD software or module for shock dynamics as the first step to build a virtual shock tube.

 

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 CFD simulation of Russian Meteor Impact on Feb. 15, 2013

                
whole_image undergrounds crater_image_small

Direct simulation of volcano eruption Red: Magma Blue: Gas

                

Magma reservoir (zoom)

Eruptive crater (zoom)

                
bubblecollapse 18bubbles

Single bubble collapsing after shock wave loading

Evolution of 15 bubbles after shock wave loading