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#1 |
New Member
Syed Mafooq Ul Hassan
Join Date: Jul 2023
Posts: 3
Rep Power: 3 ![]() |
Hi, I am new to CFD simulations. The species that I want to transport circles around the inlet and doesn't move towards the outlet. Attached, please find my configuration file and inlet.dat file.
config.txt inlet_m.txt Any help or suggestion is highly appreciated. |
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#2 |
Senior Member
bigfoot
Join Date: Dec 2011
Location: Netherlands
Posts: 596
Rep Power: 17 ![]() |
It's a bit hard to say without the mesh to reproduce the issue, but you could first try to run it :
1. steady 2. with uniform boundary conditions instead of a profile When in doubt, start from something that works, either a tutorial or one of the regression tests in Testcases/ and build up your case step by step. |
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#3 | |
New Member
Join Date: Feb 2022
Posts: 19
Rep Power: 4 ![]() |
Quote:
Are you simulating air or other gas? given your setup, it seems that you are simulating air, so if that is the case, you should check your value of the diffusivity KIND_SCALAR_MODEL= SPECIES_TRANSPORT DIFFUSIVITY_MODEL= CONSTANT_DIFFUSIVITY DIFFUSIVITY_CONSTANT= 1 1 looks quite high, the diffusivity constant should be a value around 1.8*10^-5 , so now you are using a huge value, that might explain why the species does not move towards the outlet, because the diffusivity term is too high. Also as an advice, it is recomended to set the SPECIES_INIT equal to the species mass fraction that you provide in the first inlet (0.5 if I am not mistaken) because that improves the convergence. SPECIES_INIT= 0.5 SPECIES_CLIPPING= YES SPECIES_CLIPPING_MIN= 0.2 SPECIES_CLIPPING_MAX= 1.0 Additionally, you can try the option BOUNDED_SCALAR instead of the SCALAR_UPWIND. Finally, the MARKER_INLET= (inlet, 300, 1.0, 10.0, 10.0, 0.0) (10,10,0.0) should be the normal direction of the velocity, the second value 1.0 is the magnitude of the velocity, so if your velocity is 10 m/s, you should write the marker_inlet as follows: MARKER_INLET= (inlet, 300, 10.0, 1.0, 1.0, 0.0) and the INC_VELOCITY_INIT= ( 10.00, 0.0, 0.0 ) Best regards, Cristopher Morales Ubal |
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Tags |
#cfd, #species_transport, #su2 |
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