Fluids

Fluids

Vortex street

    • Brrrr
      Subscriber

      Hello,


       


      I simulated a certain geometry in ansys student once with a power law model and then based on a carreau modell. So I chose the non newtonian fluid and added the paramters once for power law and for carreau. Geometry is both the same.  Both boundary conditions are mainly the same. Still, the carreau model simulates a vortex, looks like a Karman vortex street, and the power law hasnt any vortex. So far I checked anything I could think of. Anyone has experience with those two models, and why one creates a vortex street and the other one don't?

      Thanksupper one simulated with carreau, lower one is power law

    • Brrrr
      Subscriber

       So the flaw was as follows: The simulation with powerlaw was done with transient formualtion 1. order upwind. which has numerical diffusion that causes the momentum to diffuse, thats is why the vortex do not appear.


      Carreau simulation uses 2. order upwind. When both are done woth 2nd order, both will show vortex.

    • Karthik R
      Administrator

      Hello,


      I'm glad you were able to figure out the issue and thank you for posting the response. 


      Good luck with your simulation.


      Best Regards,


      Karthik

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