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August 19, 2013, 11:06 |
dynamic mesh adustment for phi
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#1 |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Hi
I find in icoDyMFoam, there are some operation about fvc::makeRelative(phi, U) and fvc::makeAbsolute(phi, U), I know what it means, but do not know why to do this. Who can told me the reason or provide me some papers about this? Thanks. Yu |
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August 19, 2013, 15:15 |
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#2 |
Senior Member
Matvey Kraposhin
Join Date: Mar 2009
Location: Moscow, Russian Federation
Posts: 355
Rep Power: 21 |
You must refer to Ferziger and Peric "Computational Fluid Dynamics" where they presented generalization for the Reynolds Transport Theorem for the moving control volume
Another good article: "Dynamic Mesh Handling in OpenFOAM" by H. Jasak, try to google it |
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August 19, 2013, 15:55 |
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#3 |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Thank you for your reply. I have ever read the article "Dynamic Mesh Handling in OpenFOAM" by H. Jasak, but I do not think he explained the reason to use fvc::makeRelative(phi, U) and fvc::makeAbsolute(phi, U) in details, In additon, do you know what would the function 'meshphi(U)' return ? Thank you very much.
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August 19, 2013, 17:14 |
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#4 | |
Senior Member
Matvey Kraposhin
Join Date: Mar 2009
Location: Moscow, Russian Federation
Posts: 355
Rep Power: 21 |
Quote:
DB/Dt=D/Dt(int (rho*beta)dV) + int (rho*beta*(Ua-Ub))*dS Ua - absolute velocity Ub - velocity of the control volume boundary element Ur=Ua-Ub - relative D/Dt - material derivative int (*) dV - integral over volume int (*) dS - integral over surface In OpenFOAM fvc::makeRelative(phi,U) estimates relative flux Ur=Ua-Ub fvc::makeAbsolute(phi,U) estimates total flux Ua = Ur + Ub Function fvc::meshPhi(U) returns flux of the control volume boundary Ub This functions are used to convert from/to relative fluxes to absolute when control volume is moving, see Ferziger and Peric |
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August 20, 2013, 11:27 |
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#5 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
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