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November 25, 2016, 04:12 |
Thermal cooling analysis
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#1 |
New Member
sanju
Join Date: Nov 2016
Posts: 19
Rep Power: 9 |
Hello
Kindly I request to go through the problem and find the below attached files. I have considered a cylinder with 4 holes inside for the air to flow inside. Pressure based solver with transient condition. #Problem statement. 1. Cylinder is rotating at 250 rad/sec. 2. Air is flowing inside with 8 m/s. 3. I have defined the cylinder surface temperature 0f 400K. 4. Need to do the cooling analysis of the problem. Kindly suggest me where I am doing wrong. # struggling with the time step. |
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November 25, 2016, 04:14 |
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#2 |
New Member
sanju
Join Date: Nov 2016
Posts: 19
Rep Power: 9 |
these attachments followed with the above problem.
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November 27, 2016, 00:39 |
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#3 |
New Member
sanju
Join Date: Nov 2016
Posts: 19
Rep Power: 9 |
Any experts, Please guide me.
I believe this is the best portal to learn the concept. I am student please guide me. |
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December 3, 2016, 10:07 |
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#4 |
New Member
sanju
Join Date: Nov 2016
Posts: 19
Rep Power: 9 |
Hi all again,
Find the attached files, which shows the temp-contours. From this what I understood is only air getting heated up and surface temperature is constant. Is it fluent taking continuous temperature to surface of cylinder....? I want to give only once temp to cylinder. Seniors or any one please help me with this. Thank you in advance. |
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December 3, 2016, 14:47 |
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#5 |
Senior Member
SinaJ
Join Date: Nov 2009
Posts: 136
Rep Power: 16 |
Well,
- first of all your geometry seems to be huge! I don't know what's the application but a cylinder with diameter of ~5m, is way big to be rotating at almost 2500rpm! - Your boundary conditions (BCs) seem ambiguous. if you set the surface temperature BC as T=400K, why would you expect it do decrease during the solution? If you are looking to see some sort of change on the surface, you can apply a constant flux and see temperature change by running the air stream. - It seems that your flow is turbulence. but I don't see any prism layers in your mesh! you mesh. IMO your mesh is too coarse for that problem. especially near wall regions. Consider y+ between 30 and 300, if you're using k-epsilon. - If those 4 small cylinders are holes, why do you have mesh inside them?! I think before moving forward, you need to read some tutorials for similar applications. |
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December 4, 2016, 02:58 |
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#6 |
New Member
sanju
Join Date: Nov 2016
Posts: 19
Rep Power: 9 |
Thank you sir for your valuable reply.
I will try with the heat flux. -If those 4 small cylinders are holes, why do you have mesh inside them?! I heard that where ever there is air flow, there also we should have volume mesh. If I am wrong kindly guide me. The purpose of my problem is, I want to cool the cylinder after some interval by giving initial surface temperaure. |
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December 6, 2016, 01:34 |
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#7 |
New Member
Join Date: May 2016
Posts: 3
Rep Power: 9 |
try smaller energy under-relaxation factor
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