CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Understanding implemented PISO

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   January 28, 2006, 12:11
Default hi, does anybody know why t
Senior Member
Stephan Gerber
Join Date: Mar 2009
Location: Germany
Posts: 118
Rep Power: 10
stephan is on a distinguished road

does anybody know why the flux in the icoFoam-case is calculated as it is?
there are lines like that:
volScalarField A=UEqn.A();
phi=(fvc::interpolate(U+UphiCoeff*fvc::ddt0(U)/A,"interpolate((H(U)|A(U))")&mesh .Sf())-UphiCoeff*fvc::interpolate(1/A)*fvc::ddt0(phi);

where phi itself is "linearinterpolate(U)&mesh.Sf()"
i know that i need a div-term for the pressure-eqn but what are these other terms in the phi-calculation? for me it looks like adding something in the interpolation and than substracting the same after interpolation.
Am i right, that ddt0(U) gives the old-time-value for U in discretizised form (with coefficient)?
I hope somebody can explain what happens here.
thanks in advance
stephan is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
GammaContactAngle not implemented coastal593 OpenFOAM Running, Solving & CFD 5 November 9, 2010 06:21
Convective Schemes how are they implemented nicasch OpenFOAM Running, Solving & CFD 1 November 4, 2010 09:47
Where is gSum implemented cosimobianchini OpenFOAM Running, Solving & CFD 0 September 19, 2007 12:35
Problems understanding some piso details tehache OpenFOAM Running, Solving & CFD 3 July 27, 2007 06:02
Is it implemented the QUICK scheme in the CFX? Viana CFX 2 January 23, 2006 06:08

All times are GMT -4. The time now is 17:44.