|November 28, 2010, 05:44||
Boundary conditions low Mach number flow
Join Date: Apr 2009
Posts: 118Rep Power: 9
I'm trying to study a low Mach number flow with variable density using the SIMPLER algorithm. The real problem is that of a spherically expanding flame from a point source in an unconfined space.
The physical boundary conditions are the velocity u=0 at the origin and u=0 at the far-field and pressure p=p0 at the far-field. The problem is essentially 1-D so I use a 1-D domain with a staggered grid for computations.
It is my understanding that for such a problem I only have to define either pressure or velocity at the boundaries. I seem to be getting incorrect results and I think I have issues with boundary conditions. Right now I have,
at the centre, r=0, u=0
at the far-field, r=R, du/dr = 0
I use the discretised pressure equation to obtain the pressures at the boundary using the velocities calculated at the boundary, i.e. I don't specify a particular pressure value at the boundary, it is taken from the solution.
Can anyone tell me if I'm doing anything wrong? Thanks.
|bcs, simpler algorithm|
|Thread||Thread Starter||Forum||Replies||Last Post|
|non reflective boundary conditions for incompresible flow||Pascal_doran||OpenFOAM Programming & Development||16||August 25, 2015 05:35|
|Proper Pressure Boundary Conditions for Buoyant Flow||mchurchf||OpenFOAM||0||March 25, 2010 13:16|
|Concentric tube heat exchanger (Air-Water)||Young||CFX||5||October 6, 2008 23:17|
|Outlet boundary conditions for unsteady flow||Bjorn B||Main CFD Forum||3||January 11, 2006 06:42|
|Low Mach Number Flow||Mohammad Kermani||Main CFD Forum||0||February 25, 2002 00:47|