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July 20, 2009, 13:06 |
SIMPLE algorithm, P and u at inlet
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#1 |
New Member
Join Date: May 2009
Posts: 6
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Hello everybody,
I'm solving the N-S equations using the SIMPLE algorithm. It converge fine and quite fast when I set dirichlet boundary conditions for the velocity at inlet and outlet of the channel, but I have problems when I want to set dirichlet B.C. for both pressure and velocity at the channel inlet. I'm solving the u-momentum equation at the main control volume interfaces, and the pressure correction equation at the central nodes. how should I set the pressure value on the first node, in order to fulfill the inlet pressure condition? I think the problem is there. thanks in advance Mauri |
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February 13, 2014, 10:00 |
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#2 |
New Member
Join Date: Jul 2013
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Hello Mauri,
I am having the same problem. My code works almost perfect for velocity inlet but I have problems when I try pressure BCs. Were you able to come up with a solution to set pressure inlet & outlet to your boundary? |
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March 2, 2014, 18:06 |
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#3 | ||
Senior Member
Join Date: Aug 2011
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Quote:
Imposing a neumann BC for velocity at the outlet is a better option. Quote:
If you want to impose a dirichlet BC for pressure at inlet then use neumann BC for velocity. |
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March 3, 2014, 11:04 |
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#4 |
Member
Join Date: Oct 2012
Posts: 46
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Hi!
1. The inflow conditions will be u=u_inlet, v=0, dp/dx = 0. and for outlet, we can use fully developed outflow BC, (by making few assumptions). Fully outflow BC is du/dx = 0, dv/dx = 0 and drichlette BC on pressure, ie P=0. 2.The boundaries are always given at physical domain. I believe you are familiar with concept of fictitious cell method for imposing BCs(ref. veerstag & malasekra, or milovan Peric's CFD book). if U or V lies on the "PHYSICAL BOUNDARY" of domain, leave it as it is. If the value lies at fictitious cell, then impose P_boundary = (P_fictitious+P_internal)/2 and make P_b = 0. Hope this helps. In case of doubts, please reply back |
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channel flux, n-s, simple |
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