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Upwind solvers for 1D compressible Euler eqns |
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March 11, 2010, 14:39 |
Upwind solvers for 1D compressible Euler eqns
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#1 |
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I am an introductory student in CFD. I ma solving 1D Euler equations in non-conservative form. I am able to calculate the eigenvalues and eigenvector matrix. I get eigenvalues of u, u+c, and u-c. I need to find F+ and F-. I am trying to understand the Steger-Warming and Van Leer flux splitting methods. I am having trouble figuring out how to do the Steger-Warming and Van Leer. There is no info on these schemes in Wiki. Can someone explain these simply or provide an example of them in use?
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March 11, 2010, 18:31 |
Something like this?
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#2 |
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Here describes Van Leer's splitting.
http://chimeracfd.com/programming/gr...uxvanleer.html The Steger-Warming splitting is simple. For the Euler equations, we have F = AU where F is the flux, U is the conservative state vector, and A is the Jacobian (dF/dU)! Yes, that's true for the Euler. So, if we decompose A into a positive part and negative part: A = RDL = R(Dp + Dm)L = RDpL + RDmL = Ap + Am, where R is the right-eigenvector matrix, D is the diagonal matrix with eigenvalues in the diagonal, L is the left-eigenvector (inverse of R), and Dp is D with positive eigenvalues only, Dm is D with only negative eigenvalues, THEN we can write the flux vector as F = Fp + Fm = ApU + AmU So, the positive flux is ApU and the negative flux is AmU! There is a source code for Van Leer's flux and the Steger-Warming flux at http://www.ossanworld.com/cfdbooks/cfdcodes.html Good luck. gory |
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May 1, 2010, 05:19 |
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#3 |
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erwin
Join Date: Apr 2010
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hi all.i need computer programme for solving 1D euler EQUATİONS van leer and roe scheme.plz help me
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