How to apply Neumann Boundary Condition?

- July 18, 2023 at 8:03 am
  
  Furqan
  Subscriber
  
  I am simulating a 2D multispecies model. The domain is a rectangle with velocity inlet at bottom and pressure outlet at top. There is air in the domain and vapor enters into the domain from bottom velocity inlet. I want to apply Neumann boundary condition for vapor concentration on left and right wall. Can anyone help me how to apply Neumann Boundary Condition for vapor concentration on wall?
- July 18, 2023 at 9:27 am
  
  Rob
  Ansys Employee
  
  What are you trying to control?
- July 19, 2023 at 1:38 am
  
  Furqan
  Subscriber
  
  Actually I am not controlling anything. I am just capturing partial pressure of vapor at different instances. For that I have already used the (molef*total pressure), but the vapor coming from the bottom inlet is making a very sharp curved profile as I have applied adiabatic wall boundary. I have been asked to apply Neumann Boundary condition on left and right wall and check this vapor profile in that BC.
- July 19, 2023 at 7:38 am
  
  Rob
  Ansys Employee
  
  Which is a numerical method according to Wikipedia. What do you want to control - species, temperature, heat flux etc?
- July 19, 2023 at 9:16 am
  
  Furqan
  Subscriber
  
  The species concentration
- July 19, 2023 at 9:30 am
  
  Rob
  Ansys Employee
  
  Have a look at the options in the wall boundary condition panel. What physical mechanism are you trying to replicate?
- July 20, 2023 at 1:35 am
  
  Furqan
  Subscriber
  
  Basically this is my question. Which option should I select in the wall boundary condition panel that will make the walls as "Neumann Boundary"
- July 20, 2023 at 8:06 am
  
  Rob
  Ansys Employee
  
  I don't know: we set the boundaries to replicate the physics/conditions we wish to model. So, fixed concentration, temperature, heat flux etc.

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