Modeling of underdrain Perforated pipe
I have modeled a perforated pipe surrounded by gravel . Pipe is full of water and gravel is submerged by water. Since the model was symmetry, I made it using Symmetry BC. ( Please see the attached image). I drew some hole in pipe and assigned the pipe surface as wall (in image 2 blue highlighted). So the hole acts as interior.
I assigned the gravel zone as porous zone and put necessary parameter. What I am worried about that I didn't put any parameter for pipe hole. I read the fluent manual about perforated plate. I thought since the water would see the interior just after passing the pipe wall, it would act as real hole and would calculate the loss and other phenomena automatically . After simulation, I got result with 10-21 error with experimental result. So I assume I did something wrong with pipe hole.
Could anyone please assure me if I have to assign porous jump boundary/any type BC to hole or fluent will understand automatically that its hole and will calculate the entrance and other loss on the hole?
It will be a great help. Thanks in advance.
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