[Dandandan]

Hi all,

I am currently simulating water flow in a heat sink to evaluate the performance of the heat sink. I have managed to do it previously on parametric analysis with no roughness settings. However, after applying the roughness settings (roughness height & constant), I am unable to run Ansys fluent. (see attached image) The only changes to my previous fluent setup are as such:

1. Model
- Viscous (RNG k-epsilon, standard wall fn) from (RNG k-epsilon, enhanced wall treatment)

2. Boundary Wall
- Roughness Height of 0.0004m
- Roughness Constant of 0.5

Hoping someone can help me out with this. Thank you in advance.

Edit: I have found in the Ansys Manual that rough walls cannot be applied with all K-epsilon models. In that case, what model(s) would be a good replacement?

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