the different types of boundary conditions in CFD
I'm confused by the different boundaries in CFD,such as pressure inlet ,mass flow inlet and so on.Can somebody give me some brief description about this?or can send me some information about this.(books or papers).My email is
dengli_njust@126.com Thank you. |
This is a gross-oversimplification but... think of the equation a*x=12. Without specifying a, you can never solve for x, right? Boundary conditions are known values that you apply at the boundaries of your model to allow you to solve for x, basically.
The different types of boundary conditions are there to allow you to model different physical scenarios. A mass flow inlet might be used for setting flow rate through a system of pipes. A pressure outlet might be specified at the end of the pipe to define downstream conditions (such as amibent). Velocity inlet... welll you get the idea. I do a lot of external aerodynamics so I might specify a velocity inlet (with a specific temperature, pressure and direction) for my freestream boundaries. Downstream I would put a pressure outlet so that the flow has somewhere to go. Then I might also specify a mass flow rate to set flow thorugh an engine. Does that answer your question? Also, I am not sure what your level of experience is but if BC's are confusing you its a good bet its not much. I would work some tutorials and things to get your bearings before jumping in with both feet. |
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