Boundary conditions for semi-implicit low mach number flow calculation - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Conference Papers Year : 2012

Boundary conditions for semi-implicit low mach number flow calculation

Abstract

For low Mach number flow calculation, when acoustic waves have to be captured, semi-implicit methods allow to avoid the time-step limitation that arises when explicit schemes are used. A method is suggested to solve the boundary equations so that the semi-implicitness of the algorithm is maintained, as well as its pressure-velocity coupling. This method is stud- ied theoretically and numerically, in the low Mach number regime. Partially non-reflective characteristic-based boundary conditions, with the linear relaxation form suggested by Rudy and Strikwerda, [J. Comput. Phys. 36:55-70, 1980], are considered. It is shown that their properties, well known in the framework of explicit schemes, are recovered with the proposed semi-implicit treatment and an acoustic CFL number significantly larger than unity.
No file

Dates and versions

hal-00768523 , version 1 (21-12-2012)

Identifiers

  • HAL Id : hal-00768523 , version 1

Cite

Yann Moguen, Pascal Bruel, Erik Dick. Boundary conditions for semi-implicit low mach number flow calculation. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012), Sep 2012, Vienna, Austria. ⟨hal-00768523⟩
63 View
0 Download

Share

Gmail Mastodon Facebook X LinkedIn More