2005 Fiscal Year Final Research Report Summary
Development of Variable Space Resolution Hybrid Simulation Technique for Multi-Scale prediction of Multi-Phase Flows
| Project/Area Number |
15360095
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Kobe University |
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Principal Investigator |
TOMIYAMA Akio Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (30211402)
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| Co-Investigator(Kenkyū-buntansha) |
HOSOKAWA Shigeo Kobe University, Graduate School of Sci.& Tech., Associate Professor, 自然科学研究科, 助教授 (10252793)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Interface Tracking Method / Particle Tracking Method / Multi-Fluid Model / Hybrid Simulation / Multi-Phase Flow / Multi-Scale |
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| Research Abstract |
A hybrid CMFD (computational multi-fluid dynamics) method is proposed for the prediction of multiphase flows including large-scale interface, poly-dispersed bubbles and/or drops. The method is the hybrid integration of an accurate interface tracking method (ITM), three kinds of bubble tracking methods and an averaging method based on a multi-fluid model (MFM). The integration enables us (1)to cover a wide range of d^*=d/Δx, where d is the particle diameter and Ax the grid size, and (2)to perform various kinds of multiphase CFD such as standard interface tracking simulation, bubble/drop tracking simulation, multi-fluid simulations, and hybrid simulations using an arbitrary combination of ITM, BTM and MFM. The developed method can, therefore, be regarded as a multipurpose multi-scale multiphase CFD method. The field equations, constitutive equations and numerical solution algorithms of the proposed method are described in detail in this report. A poly-dispersed air-water bubbly flow and several bubble plumes in a small open vessel are simulated using the proposed hybrid method to demonstrate its potential.
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