[lzgwhy]

Dear all,

How many kinds of boundary conditions (BCs) in OpenFoam? What are they? And how can I denote them in a BCs file of OpenFoam?

The above are some general problems I want to know. However, I faced a specific problem in practice. When I calculated the 2D flow over a 2D cylinder, I did not how to denote the boundary conditions for the cylinder wall and the external boundary which enclose the physical domain, though I knew the meaning of these BCs mathematically and how to set them in commercial software. In particular, how can I set pressure BC for a wall in OpenFoam, if there is no need to set value pressure or pressure gradient to the wall in advance? And how can I set velocity BC for a pressure outlet boundary, if there is no need to set value velocity to it in advance?

Thanks in advance!

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