Why define a grad Scheme when using linearUpwind?
I have two question regarding the div Schemes. I set my div-Schemes like this:
div(phi,U) Gauss linearUpwind grad(U)
Could you tell me why I have to define a grad Scheme when using linear Upwind as a div Scheme? I don't see the diference between linearUpwind and upwind/QUICK which would explain the need for a gradient Scheme.
I tried these:
div(phi,U) Gauss upwind
div(phi,U) Gauss upwind grad(U)
Why can I define a grad Scheme after defining a div Scheme, what does it change?
Thanks for your help in advance.
the thread below might help you to understand why you need to specify a grad scheme when using linearUpwind and what the difference is between linearUpwind and upwind.
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