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Source term convergence issues with a gas-solid model |
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#1 |
New Member
Felix
Join Date: Apr 2020
Posts: 4
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Hello friends.
I am modeling a transient particle-gas system inside a tube. The particle trajectories are calculated externally using UDFs, so I have to pass back the drag forces as source terms to take into account the effect of the particles on the gas flow. I found that fluent had difficulty converging in the case of dense particles accumulated in one or more cells (porosity becoming less than 0.5). As a result, the gas flow velocity can suddenly become very high due to the inability to converge. I tried to reduce the time step of Fluent (gas flow) to 1e-7s, and it worked well for dilute particle cases. But the problem still occurs when more particles are injected. Can anyone give me a suggestion to solve this problem? Thanks! *****Here is the udf for source terms*****: DEFINE_SOURCE(xmom_source,c,t,dS,eqn) { real source = 0.; if(initialized) { source = C_UDMI(c,t,1)/C_VOLUME(c,t); } dS[eqn] = 0.0; return source; } C_UDMI(c,t,1) stores the drag force on particles. |
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#2 |
New Member
Felix
Join Date: Apr 2020
Posts: 4
Rep Power: 6 ![]() |
Can anyone help with this problem?
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Tags |
cfd-dem, drag force, source term |
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