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Grid dependency study in building heat transfer

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Old   April 10, 2013, 13:20
Smile Grid dependency study in building heat transfer
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sunil
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Hello sir,
I am doing my M Tech Project on building heat transfer.i have considered single room of dimensions 4*4*4 m.i am applying heat flux to the walls heat flux is varying with time.i have to run my simulation for 24 hours(Total time = 86400 s) my question is for grid dependency study either i have to very both time step size and grid size(space and time) or any one of them is enough because it takes too much of computational time even for time step of 10 s to solve for given total time
Results which i am interested are
1.Average room temperature
2.avg wall temperature

Thank you sir
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Old   April 10, 2013, 16:17
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Quote:
Originally Posted by sunilpatil View Post
Hello sir,
I am doing my M Tech Project on building heat transfer.i have considered single room of dimensions 4*4*4 m.i am applying heat flux to the walls heat flux is varying with time.i have to run my simulation for 24 hours(Total time = 86400 s) my question is for grid dependency study either i have to very both time step size and grid size(space and time) or any one of them is enough because it takes too much of computational time even for time step of 10 s to solve for given total time
Results which i am interested are
1.Average room temperature
2.avg wall temperature

Thank you sir
see attached
user54862_pic391_1340124620.jpg
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Old   April 10, 2013, 21:00
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This is why I strongly recommend using adaptive timestepping. Set adaptive time stepping to home in on 3-5 coeff loops per iteration, then yoru timestep is automatically calculated and you have one less variable to do a sensitivity analysis on.
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Old   April 11, 2013, 02:10
Smile Grid dependency
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sunil
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Hello sir,
Thank you for reply. i will try to run solver with adaptive time stepping as you suggested
Thank you sir
Sunil Patil
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Old   April 11, 2013, 09:26
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see attached
Attachment 20646
Hi,

Where did you get the presentation from? What's the title of the presentation?

Thanks
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building heat transfer, grid dependency, transient analysis

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