icoFoam results don't match analytic results

pedromend · February 24, 2017, 03:58

Hello everyone,

I am quite new to cfd, I ran several simulations of a circularpipe, laminar flow with icoFoam and I've got results that doesn't match the analytic solution provided by solving equations. I'm trying to calculate the pressure drop during the cylinder, fixing the inlet velocity and the outlet pressure(or inlet and putting zeroGradient in outlet). It gaves me errors around 80% compared to the analytic equations

. Does anyone know how can I solve this, or if there is any way to predict the error? Thanks in advance

piu58 · February 24, 2017, 04:40

Do you took into account that OpenFoam uses kinematic pressure?

pedromend · February 27, 2017, 01:20

Quote:

Originally Posted by piu58

Do you took into account that OpenFoam uses kinematic pressure?

Yes I did and also took into account that the p.file is in m²/s², but still can't figure out where the problem is or if it's just a software lack of precision

February 24, 2017, 03:58	icoFoam results don't match analytic results	#1
pedromend New Member Pedro Mendonça Join Date: Feb 2017 Posts: 2 Rep Power: 0	Hello everyone, I am quite new to cfd, I ran several simulations of a circularpipe, laminar flow with icoFoam and I've got results that doesn't match the analytic solution provided by solving equations. I'm trying to calculate the pressure drop during the cylinder, fixing the inlet velocity and the outlet pressure(or inlet and putting zeroGradient in outlet). It gaves me errors around 80% compared to the analytic equations . Does anyone know how can I solve this, or if there is any way to predict the error? Thanks in advance

February 24, 2017, 04:40		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	Do you took into account that OpenFoam uses kinematic pressure? __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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