ScalarTransportFoam for RTD calculations for laminar non-Newtonian flow

sourav90 · March 11, 2021, 04:33

Hello foamers,

I am interested in getting residence time distribution for a relatively easy case: a 20m long pipe with 12.5mm diameter, modelled as axisymmetric wedge. I am following the method described here: ScalarTransportFoam for RTD calculations

i.e. running simpleFoam to get steady state velocity field (The transport model is powerLaw.) and then use it for RTD with scalarTransportFoam. However, whatever the values of DT (tried from 0.01 to 1e6), the plot of T shows only one value.

Any ideas on what could be wrong, especially since scalarTransportFoam is one of the most basic solvers in openFOAM? I can provide the case if it helps!

Thanks,

mwmalkawi · September 28, 2024, 17:04

Hi were you able to sort out your issue because I am having something similar when I put very low DT it does not give realistic results but when I increase it significantly it gives good results so woundering if sliver scalar transport foam has issues

March 11, 2021, 04:33	ScalarTransportFoam for RTD calculations for laminar non-Newtonian flow	#1
sourav90 Member Sourav Mandal Join Date: Jul 2019 Posts: 55 Rep Power: 7	Hello foamers, I am interested in getting residence time distribution for a relatively easy case: a 20m long pipe with 12.5mm diameter, modelled as axisymmetric wedge. I am following the method described here: ScalarTransportFoam for RTD calculations i.e. running simpleFoam to get steady state velocity field (The transport model is powerLaw.) and then use it for RTD with scalarTransportFoam. However, whatever the values of DT (tried from 0.01 to 1e6), the plot of T shows only one value. Any ideas on what could be wrong, especially since scalarTransportFoam is one of the most basic solvers in openFOAM? I can provide the case if it helps! Thanks,

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September 28, 2024, 17:04		#2
mwmalkawi Member Munaf Join Date: May 2019 Posts: 42 Rep Power: 7	Hi were you able to sort out your issue because I am having something similar when I put very low DT it does not give realistic results but when I increase it significantly it gives good results so woundering if sliver scalar transport foam has issues