|
[Sponsors] |
November 5, 2009, 02:51 |
calculation of gradients near wall
|
#1 |
New Member
Sumeet Kumar
Join Date: Mar 2009
Posts: 21
Rep Power: 17 |
Hi FOAMers,
I want to calculate gradients at the cell centroids connected to a wall patch. The quantities I need to evaluate are :- a) del Utau / del tau b) del Unormal / del normal c) del p / del tau Here, Utau is tangential component of velocity Unormal is normal component of velocity tau is a coordinate tangent to local wall face normal is a coordinate normal to local wall face Can someone assist me calculation of these quantities at the cell centroids. Hints and suggestions in this regard are greatly appreciated Thanks & Regards Sumeet |
|
November 5, 2009, 09:54 |
|
#2 |
New Member
Sumeet Kumar
Join Date: Mar 2009
Posts: 21
Rep Power: 17 |
Hi Again
I tried to calculate following quanitity.. 1) del p / del tau vectorField n = patch().nf() / mag( patch().nf() ) ; volVectorField gradP(fvc::grad(db().lookupObject<volScalarField>( "p"))); const vectorField gradPInternal = gradP.boundaryField()[patchI].patchInternalField(); const scalarField gradPtau = mag(gradPInternal - n * (gradPInternal & n)); The scalarField gradPtau will give me the required derivative However the above method cannot be reiterated for calculation of following derivatives.- a) del U(tau) / del tau b) del U(normal) / del normal because the U (tau) and U (normal) vectors are only defined at the cell centroids of patchInternalField list. How do I calculate such derivatives. Please someone advice. Regards, Sumeet |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[Commercial meshers] Fluent3DMeshToFoam | simvun | OpenFOAM Meshing & Mesh Conversion | 50 | January 19, 2020 16:33 |
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug | unoder | OpenFOAM Installation | 11 | January 30, 2008 21:30 |
Warning 097- | AB | Siemens | 6 | November 15, 2004 05:41 |
Multicomponent fluid | Andrea | CFX | 2 | October 11, 2004 06:12 |
Wall function in adverse pressure gradients | stephane baralon | Main CFD Forum | 11 | September 2, 1999 05:05 |