2016 Fiscal Year Final Research Report
Development of turbulence analysis method with incorporation of covariant elements
| Project/Area Number |
26420103
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Fluid engineering
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
|
|---|
| Research Collaborator |
Schumacher J. Technishe Universität Ilmenau, Department of Mechanical Engineering, Professor
|
|---|
| Project Period (FY) |
2014-04-01 – 2017-03-31
|
| Keywords | 反変性、共変性 / 高分子添加溶液 / ＭＨＤ / スカラー伝達 / 多重スケール解析 |
|---|
| Outline of Final Research Achievements |
We conduct multi-scale study on energy transfer due to polymers dispersed in homogeneous isotropic turbulence in elasto-inertial regime (EIT). Effect of non-affinity with macroscopically-imposed deformation in the motion of polymers is examined by connecting mesoscopic Brownian dynamics of dumbbells to DNS for solvent. The dumbbells are allowed to be advected either affinely (contravariant) or completely non-affinely (covariant). The relaxation time of polymer is in the order of eddy turnover time. Contravariant polymers drain more energy from the large scales than they can dissipate and transfer the excess energy back into the solvent when they are highly-stretched. The skewness of strain-rate tensor in the production term for elastic energy and dissipation rate transfer elastic energy back into the smallest scale of the solvent and increase the dissipation. In the covariant polymers, this backward transfer is eliminated and elastic energy is retained when highly stretched
|
| Free Research Field |
流体工学
|
