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February 16, 2015, 10:09 |
Cell size
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#1 |
New Member
Aberdeenshire
Join Date: Feb 2015
Posts: 11
Rep Power: 11 |
Hi all,
I am using fluent for my project and it's been very challenging as I am learning it myself with no one to guide me. I have done my meshing using edge sizing and mapped face. I would like to know my cell size to enable me choose a good time step. Does anyone know how to get this info? Thanks |
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February 16, 2015, 10:17 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,760
Rep Power: 66 |
You always need small enough cells to get spatially resolved information but if you want time-resolved simulations, then calculate your cell Courant number based on the time-step size that you want and expected cell velocity. Target Courant number ~1.
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February 16, 2015, 13:08 |
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#3 |
New Member
Aberdeenshire
Join Date: Feb 2015
Posts: 11
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Thanks LuckyTran.
I finally set up my problem and monitor. I used a UDF to define my sinusoidal velocity. However, in the monitor at the inlet I get something like this velocity monitor.JPG I expected a sine profile but the above profile is only correct form wt = 0 - pi. I'm posibly doing something wrong. Could someone kindly point me to the right direction. Thanks. |
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February 16, 2015, 14:42 |
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#4 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,760
Rep Power: 66 |
Are you specifying the profile using magnitude and direction or components. I think you should be using x,y,z components.
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February 16, 2015, 16:28 |
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#5 |
New Member
Aberdeenshire
Join Date: Feb 2015
Posts: 11
Rep Power: 11 |
I initially used magnitude and direction. I have now used components and hooked my udf in the inlet x component. I have also monitored the x component velocity close to the outlet and I can see a sine behaviour.
Thanks again luckyTran. |
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Tags |
cell size, fluent, unsteady flow |
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