what's the meaning of mismatch inter block boundaries
 

when i simulated i got the error messages read “open area mismatch at inter-block boundaries of all blocks, as % of total open area at these mesh boundaries = 1.23328E+00”, who knows what it mean and what can i do to resolve it?Thank you very much.

it's just a warning FYI. It means that at the common boundary between two mesh blocks, the open area at one block differs by 1.23% from the open area in the block on the other side. This is normal when meshes in the two blocks are different. The only way to match the open areas exactly is to have exactly the same mesh resolution in the two blocks.

On the other hand, if the areas differ significantly, there may be a loss/gain of fluid mass at it flows through the boundary. The actual loss depends on the flow and is reported by the solver as the multi-block (m/b) volume error as a function of time.

thanks for your reply! what you told is the truth!