
Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Bill McEachern Mar 16, 2012 11:07 AM (in response to Radu Popovici)I hope you didn't suppress the convection loads from flow sim when you suppressed the "convection loads" Put up a picture of hte tree as exectued. This stuff works and is pretty straight forward in my experience.

Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Radu Popovici Mar 19, 2012 11:07 AM (in response to Bill McEachern)Hello Bill,
Thanks for the reply. I still did not manage to link the fluid convection effects from the flow simulation into the thermal analysis. However, I got the needed results by running a timeenabled calculation in Flow Simulation only and setting the "maximum physical time", the "manual time step" and "periodic saving" in the "calculation control options" dialog box. So I get tabulated results as how temperature changes in time at a specific location.
Now, my problem is "solved" but I don't wish to let the topic opened after you took the time to reply. I am actually intrigued, I would like to know what I did wrong. So if you could spot the (most likely) stupid mistake I made, please let me know. I must mention that I am using the package as a design tool, trying to set any parameter which makes sense, but I do not know much about the algorithms used by the software to find a solution. Usually I build a model, validate one or two configurations with some quick experiments and later, by varying different parameters I try to optimize a design.
Below, I included some figures from a dummy calculation I run just to test this feature in the title of this post.
Thank you for your time, regards,
radu
Here is the tree in both flow and thermal simulations:
The general settings for the flow analysis you may see below:
And the properties of the thermal study below:

Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Bill McEachern Mar 19, 2012 1:24 PM (in response to Radu Popovici)It doesn't look like you have any heat sources or hot inital bits so the heat transfer is zero inthe flow case so the convection coefficients is zero. You have to realize that the convection coefficient in flow is calculated based onteh results it is not an inherent quantity. The program measures the heat transfer out of the solid, the cell area and calculates the heat transfer coefficient. so no heat transfer no heat transfer coefficient. Do a steady state heat transfer solution near the center of the range and import those values. Best I can see from what you provided.

Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Radu Popovici Mar 20, 2012 8:06 AM (in response to Bill McEachern)Makes sense, of course. Though I assumed the fluid set to 100C while the solids are at 23C would be enough. There is heat transfer from the fluid to the solids, and at steady state, the results look reasonable. I will try to add a fan or some other heat source in the fluid and check it again. Will post here the outcome. Thank you once again, regards, radu

Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Bill McEachern Mar 20, 2012 9:30 AM (in response to Radu Popovici)That should have worked. As long as you had some sort of delta T which apprarnetly you did. I take the immersed parts had a fixed temp of 23°C and the etering bulk fluid temp was 100°C. You ran a steady state analysis? If so you should send it into support. That should have worked.

Re: Fluid convection effects from SolidWorks flow simulation in thermal transient analysis
Radu Popovici Mar 21, 2012 4:17 AM (in response to Bill McEachern)Good morning Bill, thank you once again for looking into it. Though I didn't solve the problem, I cannot spend more time on this topic. I must optimize my design by making geometrical changes and I will do it in Flow simulation only. This should be enough. have a good day, regards, radu.




