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how boundary condition k dissipating into domain?

- November 1, 2021 at 1:26 am
  
  anitachen_
  Subscriber
  
  I tried to create a void domain with velocity inlet B.C. on S,E sides, outflow B.C. on N,W sides. For the velocity inlet, I used a UDF describing an atmospheric boundary layer (ABL), setting k=11.01 and the wind direction to be SSE. After reaching convergence (all residual reached 10^-4), the resulting k contour looked like this.
- November 1, 2021 at 2:26 pm
  
  Rob
  Forum Moderator
  
  The equations for the turbulence models are covered in the manual. I assume you mean pressure outlet? If you used outflow please correct and re-run.
- November 4, 2021 at 1:49 am
  
  anitachen_
  Subscriber
  
  Thank you for your advice. I have changed the outlet boundary condition to pressure outlet, and the result is similar.
  I understand the turbulence models (k and omega transport equation), just don't see why the 2 inlets(South and East sides) with the same inlet boundary condition showed different results in the near boundary area... Is there a reasonable explanation?

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