Majumdar's correction for underrelaxation

May 24, 2004, 01:48

These days, I try to implement the approach proposed by S. Majumdar (Numerical heat transfer,vol13,pp125, 1988) to solve the underrelaxation factor problem with nonstaggered grids. But it does not work well. I really need your help to analyze my problem-- How to implement the term '(1-relaxation factor)*(V*[i+1/2]-f-V*[i]-V*[i+1])'. When I add it to my code, the results still change with the relaxation factor. Could you give me a favor for this?

May 27, 2004, 04:49

fluxMaj = (1 - urf) * ( flux - density ( UE * Ax + VE * Ay + WE * Az) )

flux = ( terms u would have calculated even otherwise) + fluxMaj ; // fluxMaj is addtional

// UE VE WE are vel components at face E and Ax Ay Az are area component of the face // flux is flux thorugh the face

hope this help

May 24, 2004, 01:48	Majumdar's correction for underrelaxation	#1
Dalton Guest Posts: n/a	These days, I try to implement the approach proposed by S. Majumdar (Numerical heat transfer,vol13,pp125, 1988) to solve the underrelaxation factor problem with nonstaggered grids. But it does not work well. I really need your help to analyze my problem-- How to implement the term '(1-relaxation factor)(V[i+1/2]-f-V[i]-V[i+1])'. When I add it to my code, the results still change with the relaxation factor. Could you give me a favor for this?

May 27, 2004, 04:49	Re: Majumdar's correction for underrelaxation	#2
zxaar Guest Posts: n/a	fluxMaj = (1 - urf) * ( flux - density ( UE * Ax + VE * Ay + WE * Az) ) flux = ( terms u would have calculated even otherwise) + fluxMaj ; // fluxMaj is addtional // UE VE WE are vel components at face E and Ax Ay Az are area component of the face // flux is flux thorugh the face hope this help

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