Problem in making mesh for vertical ground loop heat exchanger

- March 29, 2022 at 1:47 pm
  
  Muhammad_Ameen
  Subscriber
  
  Hello Everyone!
  I am trying to make mesh for my vertical ground loop heat exchanger system. As i am new to fluent i am facing different type of errors while refining it. I have to control the no of elements. Can someone help me in doing that. I have a reference image of mesh that i want. I am also attaching geometry if someone want to make it. I will be very thankful.
- March 29, 2022 at 2:40 pm
  
  Rob
  Ansys Employee
  
  Staff aren't permitted to open or download files, so you can either wait for the community to answer, or post some images.
- March 30, 2022 at 10:01 am
  
  Muhammad_Ameen
  Subscriber
  
  Hi Everyone.
  Here is the image of geometry that i am trying to mesh.
  Grouting
  Pipe
  Fluid
  Pipe is u-shaped that is inside the grouting material.
  I don't have any problem when i mesh pipe and fluid geometry.
  But when i try try to include grouting in the system i get this error.
  Can anyone tell me why this error is coming?
- March 30, 2022 at 10:58 am
  
  Rob
  Ansys Employee
  
  Apologies, it looks like images are partially broken again, the OP image showed up just now. The poor mesh is likely due to the cell size. You need several cells across a gap to resolve the gradients and reduce the size jump between the surface meshes.
- March 30, 2022 at 9:28 pm
  
  Muhammad_Ameen
  Subscriber
  
  Thank you for replying issue in meshing was resolved. But after running a simulation i am getting this temperature limit. It is affecting my results. Can you please tell me why i am getting this error?
- March 31, 2022 at 1:32 pm
  
  Rob
  Ansys Employee
  
  It means the solver is struggling. Check mesh quality, and if that's OK (skew under about 0.9 or ortho quality over about 0.1 AND you have enough cells to resolve the flow) check the boundary settings.
- April 7, 2022 at 10:27 pm
  
  Muhammad_Ameen
  Subscriber
  
  Hi Rob. This is what i have in skewness. Is it fine?
- April 7, 2022 at 10:29 pm
  
  Muhammad_Ameen
  Subscriber
  
  Orthogonal Quality on average is about 0.6495.
- April 8, 2022 at 10:37 am
  
  Rob
  Ansys Employee
  
  No. Anything over about 0.9 to 0.95 is a problem. Looking at the above you need to check the size settings as the tet region is awful.
- April 8, 2022 at 9:45 pm
  
  Muhammad_Ameen
  Subscriber
  
  Can you please tell me how to refine that? And from which parameters i can control these metrics?
- April 11, 2022 at 12:51 pm
  
  Rob
  Ansys Employee
  
  Max cell size and growth rate will play a part. If you look at the mesh, what is causing the skew cells? I don't mean the settings, what physically is the problem with the cell shapes.

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