# Boundary conditions low Mach number flow

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 November 28, 2010, 05:44 Boundary conditions low Mach number flow #1 Senior Member   Join Date: Apr 2009 Posts: 118 Rep Power: 8 Hi, 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.

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