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- - **Adding a source term in k-epsilon model**
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Adding a source term in k-epsilon modelHi all,
I am testing out a model raised by S.B. Pope, which modified the epsilon equation with a source term. I tried to implement it with udf in the FLUENT, but the convergence seems to be a problem. The modified epsilon-equation looks like the following: The added source term is related to the term, which is a measure of the vortex stretching. Here, . The case I am simulating is basically a turbulent round jet. I firstly calculated the case until convergence, and then implemented the source term to the epsilon equation as the following code: Code:
`#include "udf.h"` https://image.ibb.co/f30FH0/1234.png Clearly the white line (continuity) is driven to a very high level. Also other variables would not converge. Interestingly if I do not initiate with the calculation of the standard model, the residual stabilizes at a even higher value. Cannot figure out what is going wrong. I tried to observe the flow field, and find out that the v,k,epsilon fields are all making no sense. I think the problem comes with the udf and I might have not done it properly. What I am doing is simply to add the term as the source term directly. What is the issue with that? Thanks so much for your help! |

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