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November 14, 2011, 02:42 
rhoCentralFoam linearUpwind

#1 
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Dear foamers.
I want to try the schemes linearUpwind in interpolationSchemes for rhoCentralFoam solver. In the begining my fvSchemes file looks so: Code:
fluxScheme Tadmor; ddtSchemes { default Euler; } gradSchemes { default cellLimited leastSquares 1; } divSchemes { default none; div(tauMC) Gauss linearUpwind; div(phi,k) Gauss linearUpwind; div(phi,omega) Gauss linearUpwind; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; reconstruct(rho) upwind; reconstruct(U) upwind; reconstruct(T) upwind; } snGradSchemes { default corrected; } Code:
interpolationSchemes { default linear; reconstruct(rho) linearUpwind; reconstruct(U) linearUpwind; reconstruct(T) linearUpwind; } Code:
[3] > FOAM FATAL IO ERROR: [3] Grad scheme not specified Valid grad schemes are : 8 ( Gauss cellLimited cellMDLimited extendedLeastSquares faceLimited faceMDLimited fourth leastSquares ) Code:
interpolationSchemes { default linear; reconstruct(rho) Gauss linearUpwind; reconstruct(U) Gauss linearUpwind; reconstruct(T) Gauss linearUpwind; } Code:
[17] > FOAM FATAL IO ERROR: [17] Unknown discretisation scheme Gauss Valid schemes are : 51 ( Gamma Gamma01 MUSCL MUSCL01 Minmod OSPRE QUICK SFCD SuperBee UMIST biLinearFit blended clippedLinear cubic cubicUpwindFit downwind filteredLinear filteredLinear2 filteredLinear3 fixedBlended harmonic limitWith limitedCubic limitedCubic01 limitedGamma limitedLimitedCubic limitedLimitedLinear limitedLinear limitedLinear01 limitedMUSCL limitedVanLeer linear linearFit linearPureUpwindFit linearUpwind localBlended localMax localMin midPoint outletStabilised quadraticFit quadraticLinearFit quadraticLinearUpwindFit quadraticUpwindFit reverseLinear skewCorrected upwind vanAlbada vanLeer vanLeer01 weighted ) Thanks. 

November 14, 2011, 04:46 

#2 
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Vesselin Krastev
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Location: University of Tor Vergata, Rome
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To use the linearUpwind scheme you have to specify also a gradient scheme. The correct syntax in OF2.0.x should be (for instance):
div(phi,k) Gauss linearUpwind grad(k); where grad(k) is the scheme specified for k in the gradSchemes section (in your case, the default cellLimited leastSquares 1 scheme will be selected). In OF1.7.x this syntax will not be recognized, because you have to specify explicitly the gradient scheme, like in the following example: div(phi,k) Gauss linearUpwind cellLimited leastSquares 1; Finally, just a note about div(tauMC): it is an explicitly calculated divergence term, not a convective flux term, thus the only scheme that makes sense is Gauss linear. Hope this helps V. 

November 14, 2011, 11:11 

#3 
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Thanks for your fast reply,
You tip has really helped me, but i have same questions: If i use Code:
interpolationSchemes { default linear; reconstruct(rho) upwind cellLimited leastSquares 1; reconstruct(U) upwind cellLimited leastSquares 1; reconstruct(T) upwind cellLimited leastSquares 1; } 

November 14, 2011, 11:30 

#4  
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Vesselin Krastev
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Quote:
Code:
interpolationSchemes { default linear; reconstruct(rho) Gamma 1; reconstruct(U) GammaV 1; reconstruct(T) Gamma 1; } V. 

November 14, 2011, 11:43 

#5 
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I already tried to use this:
Code:
interpolationSchemes { default linear; reconstruct(rho) Gamma 1; reconstruct(U) GammaV 1; reconstruct(T) Gamma 1; } my case has the decision only Code:
interpolationSchemes { default linear; reconstruct(rho) upwind; reconstruct(U) upwind; reconstruct(T) upwind; } Thanks. 

November 14, 2011, 11:51 

#6  
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Vesselin Krastev
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Quote:
V. 

November 14, 2011, 12:02 

#7 
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I solve a problem of the expiration stream (М~25) in vacuum what solver can you recommend? I used sonicFoam, but he required too much time for the decision.


November 14, 2011, 12:27 

#8  
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Vesselin Krastev
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Location: University of Tor Vergata, Rome
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Quote:
V. 

November 14, 2011, 12:34 

#9 
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Thanks a lot, I will try select schemes.


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