Towards development of unsteady near-wall interface boundary conditions for turbulence modeling |
| |
Authors: | S.V. Utyuzhnikov |
| |
Affiliation: | School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, Manchester, M13 9PL, UK; Moscow Institute of Physics & Technology, Dolgoprudny 141700, Russia |
| |
Abstract: | In near-wall turbulence modeling it is required to resolve a thin layer nearby the solid boundary, which is characterized by high gradients of the solution. An accurate enough resolution of such a layer can take most computational time. The situation even becomes worse for unsteady problems. To avoid time-consuming computations, a new approach is developed, which is based on a non-overlapping domain decomposition. The boundary condition of Robin type at the interface boundary is achieved via transfer of the boundary condition from the wall. For the first time interface boundary conditions of Robin type are derived for a model nonstationary equation which simulates the key terms of the unsteady boundary layer equations. In the case of stationary solutions the approach is automatically reduced to the technique earlier developed for the steady problems. The considered test cases demonstrate that unsteady effects can be significant for near-wall domain decomposition. In particular, they can be important in the case of the wall-function-based approach. |
| |
Keywords: | Domain decomposition Interface boundary condition Wall functions Turbulence Low-Reynolds-number model Unsteady problems URANS Large eddy simulation |
本文献已被 ScienceDirect 等数据库收录! |
|