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jochemvandenbosch December 22, 2011 11:34

transportProperties settlingFoam
 
Dear all. I'm trying to simulate a slurry (sand/water) flow in a pipe using settlingFoam, but I'm unsure about different entries in the transportProperties file. I have gone through Daniel Brennans thesis on which settlingFoam is based but still have some question. I want the discrete phase to be sand (rho=2650) and the continuous phase to be water (rho=1000).

- Should I define 'yieldStressCoeff' 'yieldStressExponent' and 'yieldStressOffset' if I have Binghamplastic OFF? I suppose these values don't matter?

- What should I fill in for 'plasticViscosityCoeff' and 'plasticViscosityExponent?

- Could anyone give a clearification about the simpleCoeffs and generalCoeffs?

Thanks in advance!!!

Quote:

muc muc [ 1 -1 -1 0 0 0 0 ] 0.001;
plasticViscosityCoeff plasticViscosityCoeff [ 1 -1 -1 0 0 0 0 ] 0;
plasticViscosityExponent plasticViscosityExponent [ 0 0 0 0 0 0 0 ] 0;
BinghamPlastic off;
yieldStressCoeff yieldStressCoeff [ 1 -1 -2 0 0 0 0 ] 0;
yieldStressExponent yieldStressExponent [ 0 0 0 0 0 0 0 ] 0;
yieldStressOffset yieldStressOffset [ 0 0 0 0 0 0 0 ] 0;
rhoc rhoc [ 1 -3 0 0 0 0 0 ] 1000;
rhod rhod [ 1 -3 0 0 0 0 0 ] 2650;
VdjModel simple;
simpleCoeffs
{
V0 V0 [ 0 1 -1 0 0 0 0 ] ( 0 -0.002198 0 );
a a [ 0 0 0 0 0 0 0 ] 8.84;
a1 a1 [ 0 0 0 0 0 0 0 ] 0;
alphaMin alphaMin [ 0 0 0 0 0 0 0 ] 0;
}
generalCoeffs
{
V0 V0 [ 0 1 -1 0 0 0 0 ] ( 0 -0.0018 0 );
a a [ 0 0 0 0 0 0 0 ] 1e-05;
a1 a1 [ 0 0 0 0 0 0 0 ] 0.1;
alphaMin alphaMin [ 0 0 0 0 0 0 0 ] 2e-05;
}

alberto December 23, 2011 08:20

You find the theory here:

http://powerlab.fsb.hr/ped/kturbo/Op...BrennanPhD.pdf

jochemvandenbosch December 23, 2011 08:37

Hi Alberto, I've gone through Brennan's thesis, however I'm unsure what coefficients to chose for sand. And if I have to specify 'yieldStressCoeff' 'yieldStressExponent' and 'yieldStressOffset' if I have Binghamplastic OFF?

Best regards,

alberto December 23, 2011 08:44

No, you do not need that.


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