Problem in FLUENT

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  • Last Post 19 December 2018
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ashiadarsh posted this 18 December 2018

When I was trying to run the simulation on conjugate heat transfer problem solver is showing temperature is limited to certain cells in one domain...what could be problem? Is the problem with respect to boundary conditions or with the Mesh quality?

Adarsh

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rwoolhou posted this 18 December 2018

Do you mean you're seeing a warning along the lines of "Temperature is limited to 1.000K in 1234 cells in volume 45" ?  This means the energy equation is struggling to converge: it could be poor quality cells, insufficient mesh resolution or nonphysical boundary conditions. Check the first two in the meshing tool. Check the latter in Fluent: if you're adding/removing energy in an area is there enough material to absorb or supply the heat? 

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ashiadarsh posted this 19 December 2018

Is there any limit for aspect ratio?Some of the cells my aspect ratio is above 1000...

rwoolhou posted this 19 December 2018

Yes and no. I tend to keep aspect ratio below about 5 (ideally 2) for normal flow systems and conduction problems. If the flow is aligned with the cell then the lengthways aspect ratio can exceed 100: this often occurs in inflation layers. 

Depending on your cell type can you also check skewness? If it's over about 0.9 then please have a look at the geometry in that area and remesh. 

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