砂が関係する熱流体現象のマルチフィジックスCFDシミュレーション(<小特集>マルチフィジックスCFD/EFDの最前線)

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  • Multi-Physics CFD Simulations on Heat and Fluid Flow Phenomena with Sand Transfer(<Special Issue>The Forefront of Multi-Physics CFD/EFD)
  • 砂が関係する熱流体現象のマルチフィジックスCFDシミュレーション
  • スナ ガ カンケイ スル ネツ リュウタイ ゲンショウ ノ マルチフィジックス CFD シミュレーション

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A single-physics CFD simulation has been established now, and it is daily used in design and analysis processes of various machines. Therefore, a multi-physics CFD simulation would be a key technology to be researched and developed in near future. We can easily find a number of multiphysics phenomena in nature and machines, but we cannot simulate most of them. That is, there still remain many difficulties in a multi-physics CFD. For example, the modeling of physics except for heat and fluid flow has not been developed yet. In the present article, I briefly explain the state of the art of a multi-physics CFD simulation, focusing on the coupling method between flow and other physics, and then describe our researches on (1) sand transfer in a desert and its suppression with a wind-breaking fence and (2) particle deposition phenomena on the turbine vane in a jet engine. In both simulations, a weak coupling method was employed, taking into account the time scales of the physics embedded in the phenomena. Using the computational results, the characteristics of each phenomenon were discussed and some useful insights for improving the multi-physics simulation were obtained.

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