2016 Fiscal Year Final Research Report
Analytical assessment of energy transfer across scales in turbulence
| Project/Area Number |
26420122
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Fluid engineering
|
|---|
| Research Institution | Keio University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2014-04-01 – 2017-03-31
|
| Keywords | 流体工学 / 乱流 / 数値流体力学 / LES / 渦 / エネルギー輸送 / SGSモデル |
|---|
| Outline of Final Research Achievements |
In large-eddy simulation (LES), the grid-scale eddy is directly computed, and the subgrid-scale (SGS) eddy is modeled. The effect of the SGS modeled term on the energy transfer is assessed by using direct numerical simulation. However, the behavior of the modeled term is unclear because turbulence is complicated. It is well known that the eddy in turbulence is approximated by the elliptic Burgers vortex. In this study, by taking the filter operation to the elliptic Burgers vortex with asymptotic solution, we examine the SGS energy transfer around the elliptic vortex in LES.
As a result, we found that the SGS energy transfer from large scale to small scale, i.e., forward scatter, and the backward energy transfer, namely, backscatter distribute as a quadrupole around the vortex. Moreover, we revealed the difference of the SGS energy transfer distribution by each modeled term in the SGS stress tensor.
|
| Free Research Field |
流体力学
|
