[ANSYS Meshing] is my memory usage normal?

Renold · April 2, 2019, 18:50

Hi,

I am meshing a CVD chamber with a showerhead with 13350 holes in it. To reduce the meshing complexity, I divided the showerhead and its connecting upper and lower spaces into 13350 parts and each part has an upper block, a counterbored hole and a lower block. Then I meshed one of these parts by multizone method and copy the mesh to all other parts. I am half way done and the mesh contains 57M elements. The committed memory in the windows task manager shows 186/187GB. My computer has dual Xeon silver 4110 CPU and 128G memory. Based on the memory usage increase with the parts that the mesh is copied to, the final memory usage will be about 400G. I wonder if this memory usage is normal.

flotus1 · April 9, 2019, 07:55

Such a high memory usage does not seem completely unreasonable given the complexity of your model.
I think you should take one step back and think about which results you want to produce. Maybe there is a different modeling approach that does not require all 13350 holes to be accurately- represented in your model.
E.g. making use of symmetries, simulating the flow through only one hole, lumping together the flow through all holes with some average quantities... just to name a few. Which one might be suitable for you depends on which results you want.

Renold · April 9, 2019, 14:09

Quote:

Originally Posted by flotus1

Such a high memory usage does not seem completely unreasonable given the complexity of your model.
I think you should take one step back and think about which results you want to produce. Maybe there is a different modeling approach that does not require all 13350 holes to be accurately- represented in your model.
E.g. making use of symmetries, simulating the flow through only one hole, lumping together the flow through all holes with some average quantities... just to name a few. Which one might be suitable for you depends on which results you want.

Thank you for reply!

April 2, 2019, 18:50	is my memory usage normal?	#1
Renold New Member Join Date: Apr 2009 Posts: 24 Rep Power: 17	Hi, I am meshing a CVD chamber with a showerhead with 13350 holes in it. To reduce the meshing complexity, I divided the showerhead and its connecting upper and lower spaces into 13350 parts and each part has an upper block, a counterbored hole and a lower block. Then I meshed one of these parts by multizone method and copy the mesh to all other parts. I am half way done and the mesh contains 57M elements. The committed memory in the windows task manager shows 186/187GB. My computer has dual Xeon silver 4110 CPU and 128G memory. Based on the memory usage increase with the parts that the mesh is copied to, the final memory usage will be about 400G. I wonder if this memory usage is normal. Last edited by Renold; April 2, 2019 at 20:51.

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April 9, 2019, 07:55		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Such a high memory usage does not seem completely unreasonable given the complexity of your model. I think you should take one step back and think about which results you want to produce. Maybe there is a different modeling approach that does not require all 13350 holes to be accurately- represented in your model. E.g. making use of symmetries, simulating the flow through only one hole, lumping together the flow through all holes with some average quantities... just to name a few. Which one might be suitable for you depends on which results you want.