Fluids

Fluids

Are there boundary conditions that is able to be used instead of periodic boundary condition?

    • P_Heng
      Subscriber

      Hello everyone, have the awesome day.


      I have some problems to ask all of you.


      I got a research from my professor and the research is related to the fluid flowing across the domain under the ground. 


      I have to use the periodic boundary condition for my domain because This research involves the nature flow and I am allowed to add the gravity = 1, viscosity = 1, density = 1 (using boussinesq) only. 


      For my whole domain I can use the periodic boundary condition. And then, my professor wanted me to cut the domain into 4 sections and I can still use the periodic boundary condition because both interfaces are the same shapes. 


      The problem comes now when my professor wanted me to cut the domain into 8 sections and I cannot use the periodic boundary condition because both interfaces are not the same. I will send the pictures for all of you.


      I want to know that are there boundary conditions that is able to be used instead of periodic boundary condition? 


      I also want to tell that the velocity result of whole domain and 1/4 domain are the same. But their results are different from 1/8 section of domain because I cannot use the periodic boundary condition for 1/8 and I try the other boundary condition, such as symmetry boundary condition.


      Inside curves of the domain is solid.


      Thanks for your time.

    • P_Heng
      Subscriber
      Hello everyone
      I want to know that are there boundary conditions that is able to be used instead of periodic boundary condition for 1/8 sections domain?

      My regards P. Heng.
    • Rob
      Ansys Employee
      Given that gravity will act "up" and that the surfaces aren't periodic I don't know which boundary you can use as the results will be computationally correct but physically meaningless. However, with that mesh I'd not trust any results from the solver.
    • P_Heng
      Subscriber


      Thanks for your response.

      I ever did 1/4 section of domain with periodic boundary condition, but my professor wants me to try 1/8 section of domain.

      Anyway, thank you again.

      My regards P. Heng.
    • Rob
      Ansys Employee
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