test cases for 1D inviscid incompressible flow
Hello, guys
I have always been focusing on compressible flow. However, I would like to solve some incompressible problems. I prefer somebody could send me 1D test cases governing by Euler equations. The test case had better be a benchmark problem with exact solution. I would be grateful if anyone could share his wisdom and experiences. Best Regards, |
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Thank you for reply.
Maybe I did not express myself clear. I want to solve incompressible flow with artificial compressibility. So a pseudo time will be added into the mass conservation law. I just want to ignore viscous terms first. Maybe there remains some problems. |
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d rho/dt + d(rho*u)/dx=0 how do you enforce the "incompressible" constraint? |
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Say d rho*/d t*, and t* is a pseudo time, rho* is a pseudo time. p= beta×rho*, p is pressure and beta is a parameter to be determined. We can apply time-marching strategy into incompressible flow problems with AC(artificial compressibility). See in: Chorin, Alexandre Joel. "A numerical method for solving incompressible viscous flow problems." Journal of computational physics 2.1 (1967): 12-26. The first paper for AC. Hope I express myself clear this time. |
but at a physical steady state with rho=constant you simply get du/dx= 0...
therefore your solution is a constant state for the velocity...It can only vary with time according to du/dt + dp/dx=0. But dp/dx is rho dependent.. |
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The paper of Chorin is for a 2D flow... |
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--I intend to combine AC with high order method for time-marching problem. I don't know whether this way can work, so I want to begin the simple case: 1D. What is your suggestion? |
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even with viscous term in 1D you get u= constant ... the simplest 1D model is the Burgers equation in which du/dx does not vanish (therefore is a compressible model)... otherwise you must solve a 2D problem enforcing Div v =0 |
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And still, my original purpose is to ask for benchmark cases.
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- lid driven cavity - backward facing step - analytical Taylor solution |
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