|February 1, 2017, 16:44||
Wrong treatment of time derivatives in matrices (Jasak Presentation)
Join Date: Oct 2010
Location: Leoben (Austria)
Blog Entries: 6Rep Power: 31
today I got an interesting presentation that was held last year Hrvoje Jasak with the title Pressure-Velocity Coupling in FOAM - Consistent Derivation for Steady and Transient Flow Solvers. Here it is described that the included time term in the matrices:
fvVectorMatrix UEqn ( fvm::ddt(U) ... )
Can someone provide some information about that and does anyone know if this will be re-implemented in a correct and consistent way in future like Jasak suggested? However, there is one question left because based on the fact that the developers introduced the ddtCorr() function, they know that there is a problem (more or less), so why do they patch it instead of fix it. Maybe there is some special meaning of doing it in that way or there is no other possible way (but again, Jasak demonstrated it).
In addition I want ask kindly if this ddtCorr is related to the Rhie Chow Interpolation because something is mentioned here: DdtPhiCorr However, here it is said that this stuff is consistent while Jasak mentioned in his presentation, that it is not consistent. In addition I will check out the paper that is mentioned in the above mentioned thread.
Thanks in advance.
|Thread||Thread Starter||Forum||Replies||Last Post|
|decomposePar problem: Cell 0contains face labels out of range||vaina74||OpenFOAM Pre-Processing||27||November 2, 2015 18:04|
|Moving mesh||Niklas Wikstrom (Wikstrom)||OpenFOAM Running, Solving & CFD||122||June 15, 2014 06:20|
|Unstabil Simulation with chtMultiRegionFoam||mbay101||OpenFOAM Running, Solving & CFD||13||December 28, 2013 14:12|
|pisoFoam with k-epsilon turb blows up - Some questions||Heroic||OpenFOAM Running, Solving & CFD||26||December 17, 2012 04:34|
|AMI speed performance||danny123||OpenFOAM||19||October 24, 2012 07:44|