# Help on simulation domain

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 June 5, 2002, 08:34 Help on simulation domain #1 Derek Jing Guest   Posts: n/a Hi all, Now I am going to model following problem: A hopper is fully loaded with small sands. The sands will flow download, go through the hopper orifice and finally fall into a tank below the hopper. The simulation will stop after all sands have flowed out of the hopper. The main result I hope to obtain is the mass flow rate through thre hopper orifice. Now my question is: Shall my simulation domain only include the hopper itself, or include both the hopper and the tank? If I use the former, the sand mass in my domain will be less and less. If I use the later, the mass in the domain will be constant. I prefer to use the former choice, but I am not sure whether it is correct. Can you give me some advice on using which domain? Your help is greatly appreciated. -Derek

 June 5, 2002, 23:29 Re: Help on simulation domain #2 mukkarum Guest   Posts: n/a Dear Sir I am working on research project "revemping of Francis Turbine applying CFD". I have got book "An introduction to computational fluid dynamics (finite volume) by malalasakra" it is very good book and i have understand SIMPLE, SIMPLER AND SIMPLEC method of solving Navier Stock equation but in this book just presentation that how Navier Stock equation can be solved but there is no solve example. Do you know any book or article in which this type of example is present. I mean that for any given problem(good if turbine rotor)firstly assume pressure field and then find velocity field then check pressure correction equation and repeat this procedure still convergence occure. waiting for your prompt reply thanks

 June 6, 2002, 10:05 Re: Help on simulation domain #3 Li Yang Guest   Posts: n/a Hello Mukkarum, See my reply above. But please do not post the same request so many times. Regards Li

 June 6, 2002, 20:21 Re: Help on simulation domain #4 Derek Jing Guest   Posts: n/a Hi, I am sorry that I have no idea about this. Maybe you can check some books of Patankar and Spalding. Good luck. -Derek