how we know whether mesh appropriate or not??????
In other words, the mesh should do what you need it to do and it shouldn't do unwanted things.
It depends on what you are trying to do, but the rest are just details. If you have a particular application in mind then we can help you detail by detail.
You can do a grid study to get to know if you grid is fine enough.
If you use a structured grid there is a good approach by Roach:
P.J. Roach. Perspective: A Method for Unifrom Repoting of Grid Refinement Studies. Journal of Fluids Engineering, 116:405–413, 1994.
And Celik shows a step by step instruction for this method:
I.B. Celik. Procedure for Estimation and Reporting of Discretization Error in CFD Applications. Journal of Fluids Engineering, 130(7), Juli 2008.
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