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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: richpaj

Forum: OpenFOAM Running, Solving & CFD July 2, 2014, 22:49

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj Oh right, sorry for the misinterpretation. But... Oh right, sorry for the misinterpretation. But otherwise, DDt(p) != DDt(p_rgh) owing to the spatial cpt of DDt(..), but presumably this latter is assumed to be much smaller than the value of...

Forum: OpenFOAM Running, Solving & CFD July 2, 2014, 21:21

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj In p(tot) = pd + p0 + rho (g . z), p0 = 0 and ... In p(tot) = pd + p0 + rho (g . z), p0 = 0 and 'vector' g = (0, 0, -g), which accounts for the sign. Rgds, Richard K.

Forum: OpenFOAM Running, Solving & CFD July 2, 2014, 11:55

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj Hello Gucong, the expression looks like a... Hello Gucong, the expression looks like a variation on the original (circa OF17) but I think the same reasoning/derivation still applies, but now of course it appears the 'dynamic' and 'static'...

Forum: OpenFOAM Running, Solving & CFD June 5, 2013, 21:15

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj Hello there, 1) but the source terms it... Hello there, 1) but the source terms it references are located on the RHS of the given equation in the following canonical manner L[U] = SP + SU (where L is some differential operator and...

Forum: OpenFOAM Running, Solving & CFD June 4, 2013, 21:16

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj By way of example, in D[ alpha ]/Dt = rho *... By way of example, in D[ alpha ]/Dt = rho * alpha rho < 0 : treated implicitly i.e. reinforces diagonal coefficient of alpha, rho > 0 : treated explicitly which informs the handling of...

Forum: OpenFOAM Running, Solving & CFD May 21, 2012, 21:27

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj Ok now I understand, I think you appear to have... Ok now I understand, I think you appear to have overlooked the factor "alpha1" that will multiply 'Sp' in fvm::Sp (Sp, alpha1) cf. MULESTemplates.C where the matrix equation to be solved is: ...

Forum: OpenFOAM Running, Solving & CFD May 21, 2012, 11:01

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj yes, what you write looks correct, must've... yes, what you write looks correct, must've composed the original in haste or late at night (!) dgdt is evaluated in pEqn cf. dgdt = (pos(alpha2)*(psi2/rho2) -...

Forum: OpenFOAM Running, Solving & CFD September 1, 2011, 06:11

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj >>>DDt is the convective derivative and Ddt is... >>>DDt is the convective derivative and Ddt is the lagrangian temporal derivative. >Isn't it the same? >>best, >>Ilya yes, you're quite right, I should've written "DDt is the convective...

Forum: OpenFOAM Running, Solving & CFD January 28, 2011, 04:03

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj >what's the difference between DDt( p ) and DpDt?... >what's the difference between DDt( p ) and DpDt? Both seem to be Lagrangian >derivatives of pressure... DDt is the convective derivative and Ddt is the lagrangian temporal derivative. >alpha1...

Forum: OpenFOAM Running, Solving & CFD September 29, 2010, 02:56

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj I see now I made a mistake in the identification... I see now I made a mistake in the identification of dgdt it should be: dgdt = { ( psi2 / rho2) - (psi1 / rho1) } DpDt The RHS of (4) can now be written as: RHS = - ( alpha1 * psi1 / rho1)...

Forum: OpenFOAM Running, Solving & CFD September 25, 2010, 08:14

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj Hello there, My understanding though is that... Hello there, My understanding though is that discretization is applied to the conserved form of the phase fraction equation for alpha1 in order to permit a conserved representation of interface...

Forum: OpenFOAM Running, Solving & CFD September 24, 2010, 15:36

Replies: 72 Formulation in compressibleInterFoam Views: 31,161 Posted By richpaj dgdt source term in alpha equation Just to recap before I make an observation about the code details we have the following equations for the 2 phase mixture: rho (mixture density) = alpha1 * rho1 + alpha2 * rho2 ......(1) Mass...

Showing results 1 to 12 of 12

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