About compressible flow at low mach
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:
stream flow Mach number M=0.01
space: MUSCL method
Roe average method
time: LUSGS method
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?
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
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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