# heat transfer

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 February 21, 2007, 07:06 heat transfer #1 nathan Guest   Posts: n/a Sponsored Links Hello I'm a university student and have very little experience using fluent and wondered if any one could help me. I'm trying to model a turbine blade in gambit and then solve it in fluent for heat transfer. Could anyone tell me anything they think I should be considering or need to know before I can do this? Any help would be GREATLY accepted Thanks in advance Nathan

 February 22, 2007, 21:42 Re: heat transfer #2 dan Guest   Posts: n/a hi Nathan, I'm doing the same simulation. What do you need? dan

 February 23, 2007, 05:50 Re: heat transfer #3 nathan Guest   Posts: n/a Hi dan Thanks for your response. To be honest I'm not 100% sure how to go about this problem. My project supervisor just doesn't seem to want to know. We don't have GTubro at my uni so I've been trying to model a turbine blade in gambit without it but have come up with something that looks more like an aerofoil. I looked but couldn't find any geometry I could use from the net. I'm about to start with Fluent but not sure what boundary conditions etc i should be using. Thanks Nathan

 February 28, 2007, 10:44 Re: heat transfer #4 Pratik Mehta Guest   Posts: n/a R u simulating a 2d or 3d flow ,i guess it should be a 2d simulation but anyways let me know this first regards pratik

 February 28, 2007, 11:04 Re: heat transfer #5 dan Guest   Posts: n/a Hi Nathan, I don't think you can properly model a turbine blade (expecially in 3D) without the correct geometry information. If you model a blade passage you can use Pressure Inlet and Outlet B.C., Periodic on side boundaries, and Wall B.C. on pressure and suction sides of the blade. hope it helps

 February 28, 2007, 12:09 Re: heat transfer #6 nathan Guest   Posts: n/a hi pratik thanks for your response. It will be a 2d simulation. Cheers Nathan

 February 28, 2007, 12:12 Re: heat transfer #7 Pratik Mehta Guest   Posts: n/a ok dude i will help u out , since its time out for me , i will check u 2morrow , ok ciao pratik

 February 28, 2007, 12:16 Re: heat transfer #8 nathan Guest   Posts: n/a hi Thanks for your help. I've modeled a 2d shape to resemble a turbine blade. Not sure what else i can do really without Gturbo. I'm about to start using it with fluent. Should i be using a single blade or using two and observing the flow between them. Thanks again Nathan

 February 28, 2007, 12:23 Re: heat transfer #9 dan Guest   Posts: n/a Nathan, you can simulate a single blade passage (one blade) and apply periodic b.c. midway into the passage to simulate an infinite blade row.

 February 28, 2007, 12:45 Re: heat transfer #10 nathan Guest   Posts: n/a I see what you mean now. That's great thanks . Going to give it a go with Fuent tomorrow. Is there anything else i'll need to know before i can simulate a flow? nathan

 February 28, 2007, 13:41 Re: heat transfer #11 nathan Guest   Posts: n/a ok mate, thanks alot. nathan

 March 1, 2007, 06:31 Re: heat transfer #12 Pratik Mehta Guest   Posts: n/a well, i think the suggestoins from dan seems to be the way u must carry out the simulation , i have a question , are you also loookin for heat transfer or just flow simulation? ,have u decided how big will be your domain upstream and downstream, .if not ,please look into this factor, generally the upstream should be around 6*Diameter of the entrance , while downstream could be same or more . U must anyways check it with the convectional figure as well. Using periodic boundary condition is correct , or even symmetry be used ,i guess as u r not excepting the flow normal to the boundary which u will name symmetry or periodic . either of them should be fine , what do u think dan ? try to use a quad pave mesh it may help u to get good results anyways i hope this should help , if u need some more help kindly let me know regards pratik

 March 1, 2007, 15:33 Re: heat transfer #13 dan Guest   Posts: n/a I think that is ok. You can also refer to the chord length of the blade to place inlet and outlet of the domain, place the outlet far enough to avoid reversed flow messages.Quad mesh is the best choice if the flow is aligned with the boundaries, but triangular mesh may be easier to create. Also, create a b.l. mesh on the blade and check the y+ at the end of the simulation. regards

 March 3, 2007, 12:55 Re: heat transfer #14 Pratik Mehta Guest   Posts: n/a i agree , so nathan do u have any update from your simulations?

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