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October 26, 2009, 09:31 |
About compressible flow at low mach
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#1 |
New Member
WANG
Join Date: Oct 2009
Posts: 1
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Dear CFD friends,
now,I have a question about calculation of compressible flow at low mach,But I can not get a good result.I can not find reasons. Calculation condition as follows: [1]stream flow Mach number M=0.01 [2]Rey=6e4 [3]space: MUSCL method Roe average method [4]time: LUSGS method [5]Laminar flow method(Compressible flow Code is used) By these conditions,for example,If Roe-average method is used at very low Mach number(Mach number M=0.01) by Compressible flow Code,Can I get good result? Thanks |
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October 26, 2009, 11:19 |
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#2 |
Super Moderator
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You will get very bad results at such low mach numbers with a compressible code. You need to use some preconditioner. A easy preconditioner for roe scheme can be found in
Herve and Viozat http://citeseerx.ist.psu.edu/viewdoc...10.1.1.35.2610 |
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October 26, 2009, 22:21 |
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#3 |
New Member
Rudhi Kurniawan
Join Date: Oct 2009
Posts: 1
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Hi, im mechanical engineering student and i make an unsteady compressible navier-stokes simulation at low speed, using C++, mccormack scheme.
when i place an obstacle, i got good result, with 1500 iteration i can see that the flow is convergence and it has vortex flow on it. Beautiful ... The problem is interaction between fluid flow and boundary is very weak, what should i do to fix it??? It is channel flow with u = 3 m/s, channel length 10 cm, height 10 cm. can somebody help me??? |
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