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Active Member
CStrass
Posts: 9
Registered: ‎02-22-2013

Re: Meshing issue? Solver exits unexpectedly

04-03-2013 08:39 AM in reply to: wildej

it turns out having a student account and a regular account does funky stuff with email addresses.  It has now been updated to one that will actually get through to me.  Could you please re-send it? (it should be showing a @gatech.edu address)  Apologies again.

 


Sure, i'll add that to the upload.

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Product Support
wildej
Posts: 838
Registered: ‎08-25-2011

Re: Meshing issue? Solver exits unexpectedly

04-04-2013 06:33 AM in reply to: CStrass

Hi Colin,

 

I have taken a look at this. I can see the issue.

 

I doubt very much that we could even run this model as it is, there is far too much detail in there with the numerous holes in the filter. It would require such an inordinate amount of PC power.

 

The best suggestion I can make is that we replace that part with a solid in CAD and then make it a resistance in CFD.

These are customisable parts that act like filters with none of the detail, so we would still have the same pressure drop over it, but we just would not see the localised velocity effects.

 

How does that sound?

 

Kind regards,

Jon



Jon Wilde
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Active Member
CStrass
Posts: 9
Registered: ‎02-22-2013

Re: Meshing issue? Solver exits unexpectedly

04-04-2013 06:44 AM in reply to: wildej
Well, there are 2 primary reasons for me to run this cfd:
1) determine how turbulent the flow will be downstream of the filter
given an upstream vorticity
2) determine the total pressure drop across the system

I didn't think that resistance components could help much with either of
those; can they help with that?

Collin Strassburger
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Product Support
wildej
Posts: 838
Registered: ‎08-25-2011

Re: Meshing issue? Solver exits unexpectedly

04-04-2013 06:49 AM in reply to: CStrass

Hi Colin,

 

This is exactly what the resistance materials are for :smileyhappy:

 

1) If you set this up using a Free Area Ratio in the main flow direction 9based on the ratio of holes/solid) and a high (1e8) constant resistance in the other 2 directions then this would be fairly representative. The flow would be straightened as you would expect - it would be uniform over the area though.

 

2) Yes, this would be very representative.

 

Bear in mind that you must apply a good uniform mesh to the part - at least 3-4 elements from inlet to outlet.

 

I would have thought this is the best/only approach to take here.

 

Kind regards,

Jon



Jon Wilde
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Active Member
CStrass
Posts: 9
Registered: ‎02-22-2013

Re: Meshing issue? Solver exits unexpectedly

04-04-2013 07:03 AM in reply to: wildej

Awesome; thanks for the info. :smileyhappy:

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