# Gradient schemes and backward second order time scheme

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

 August 13, 2013, 07:01 Second order time scheme #2 New Member   Jialin Su Join Date: Mar 2013 Location: Loughborough Posts: 29 Rep Power: 4 I managed to use the second order time scheme with rhoPimpleFoam. It seems it's not really working well with sonicFoam, which I used in my previous post.

 August 13, 2013, 22:52 The UEqn.H in firepoolFireFoam #3 Member   赵庆良 Join Date: Aug 2013 Posts: 56 Rep Power: 4 Hi Foamers: According to the following codes in UEqn.H: fvVectorMatrix UEqn ( fvm::ddt(rho, U) + fvm::div(phi, U) + turbulence->divDevRhoReff(U) == parcels.SU(U) ); UEqn.relax(); if (pimple.momentumPredictor()) { solve ( UEqn == fvc::reconstruct ( ( - ghf*fvc::snGrad(rho) - fvc::snGrad(p_rgh) )*mesh.magSf() ) ); } The momentum equation that the smallpoolFire2D sloves is fvm::ddt(rho, U)+ fvm::div(phi, U)+ turbulence->divDevRhoReff(U) ==parcels.SU(U)+fvc::reconstruct((- ghf*fvc::snGrad(rho)- fvc::snGrad(p_rgh))*mesh.magSf()). I understand all term in the equation except the term of "parcels.SU(U)". In many example in OF,there is no term of "parcels.SU(U)" in UEqn.H.How can understand the term?Is there any theory about the term? please some foamers know tell me.I really need help! Thank you!

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Deepak Main CFD Forum 16 November 29, 2014 21:54 fisch OpenFOAM Running, Solving & CFD 0 January 26, 2012 04:03 idrama OpenFOAM 3 October 27, 2010 18:09 maka OpenFOAM Bugs 9 January 19, 2009 12:58 christian OpenFOAM Running, Solving & CFD 3 December 17, 2007 09:21

All times are GMT -4. The time now is 06:40.