Radiator fins mesh

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  • Last Post 21 April 2020
diogogomes posted this 19 April 2020

Hi,

 

I'm currently trying to simulate a cooling system for my student hydrogen boat team competition which includes a radiator which I modeled with solidworks:

As its geometry is really complex, I'm only simulating two columns and a fin in order to simplify. Therefore, I created this assembly:

The air domain is transparent, two colums where the cooling fluid flows and some fins (can't cover it all due to student software limitations). In design modeler  I merge the 4 bodies into 1 part to avoid contacting regions in solver, I then proceed to build the mesh in mechanical, and I end up with more bodies than the 4: it seems that each contact area between the fins and one of the columns creates a body. Plus the other colums creates separated faces in the areas of contact: 

(in geometry the first four elements are the ones in designmodeler and the "retangulo" after are the bodies created randomly. Should this happen? If not, what could be the problem? 

 

The mesh I get is reasonable overall but there are some elements with almost skewness one wish I cannot get rid of, if someone could take a look, I'd be really appreciated as I'm fairly new to ansys system (I'm leaving the f). It appears that the mesh of the air domain in contact with the fins is the reason, I believe it's because the fins have a 0.1 mm thickness. Is there any way to avoid this?

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rwoolhou posted this 20 April 2020

Can you show what you've got in DesignModeler?  

Poor element quality in this sort of system is typically associated with large jumps in cell size over small gaps or poor chosen sizing on a narrow surface.  If you use the Mesh Metrics you can plot the quality & highlighting a column will show where these cells are. 

kkanade posted this 21 April 2020

please check orhtogonal quality. 

the min orthogonal quality should be above 0.1. 

please check where those bad elements are coming. please check following video. 

then you can do corrections like geometry modifications, change in meshing sizes etc. 

Regards,

Keyur

 

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