Modelling / Meshing General Question

Anonymous — Thu, 26 Feb 2015 01:16:31 GMT

Autodesk CFD Community,

I have a couple of general queries which I would like to clarify, these relate to setting up the model.

I have a simple CFD scenario of a large room with some heat loads and an HVAC system, and want to output the average air temperature at 2m above floor level, but only for a portion of the room, as per the attached image. Is this possible when there is only one air volume within the space, or is the best approach to model a separate air volume that includes only the floor plan of area I want to measure, and then let CFD void fill the remaining geometry?
In modelling a tunnel, I have constructed the geometry in sections, in much the same way as would be constructed in reality. Refer the attached image. These sections of tunnel are 3m wide. I have found that the mesh gets finer around the ‘seams’ between each section , and in some cases even though the sections are perfectly joined there seems to be a leakage into the model – granted this occurs mainly when the mesh is course. Is there a way to ‘smooth’ out the mesh so it ignores seams between parts?

Thanks,

Andrew.

Re: Modelling / Meshing General Question

Jon.Wilde — Thu, 26 Feb 2015 10:39:52 GMT

Hi Andrew,

Your approach sounds sensible - if you have a separate volume you could measure the average temp within it using the 'Parts' option
Try increasing the Edge Length that the mesher refines down to. Check out the help here: Edge Length

Thanks,

Jon

Anonymous — Thu, 26 Feb 2015 23:54:13 GMT

Great thanks