Define_net_reaction_rate

study_CFD · December 15, 2021, 20:52

Hello everyone, thank you for taking the time to read my post！

I am using species transport - Volumetric - finite rate/No TIC. Because the reaction form is special, I need to use UDF and stiff chemistry solver, so I choose DEFINE_NET_REACTION_RATE.

When I use the explicit solver and DEFINE_VR_RATE,I achieved good results. I directly change the UDF to DEFINE_NET_REACTION_RATE and the explicit solver to stiff chenistry solver, but the calculation cannot converge.Is there anything else to set？

Has anyone used this UDF? I really need help!

study_CFD · December 16, 2021, 07:30

Has anyone used this? It's OK to have relevant cases to me

study_CFD · December 17, 2021, 02:29

Can I set the reaction like this Attach Files?

December 15, 2021, 20:52	Define_net_reaction_rate	#1
study_CFD New Member Jinshan Yi Join Date: Dec 2021 Posts: 7 Rep Power: 5	Hello everyone, thank you for taking the time to read my post！ I am using species transport - Volumetric - finite rate/No TIC. Because the reaction form is special, I need to use UDF and stiff chemistry solver, so I choose DEFINE_NET_REACTION_RATE. When I use the explicit solver and DEFINE_VR_RATE,I achieved good results. I directly change the UDF to DEFINE_NET_REACTION_RATE and the explicit solver to stiff chenistry solver, but the calculation cannot converge.Is there anything else to set？ Has anyone used this UDF? I really need help!

December 16, 2021, 07:30		#2
study_CFD New Member Jinshan Yi Join Date: Dec 2021 Posts: 7 Rep Power: 5	Has anyone used this? It's OK to have relevant cases to me Last edited by study_CFD; December 17, 2021 at 02:24.