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Old   January 17, 2007, 04:26
Default How to fix this?
  #1
Wilson
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Hi, I am interested in monitoring the pressure contours across the condenser, where in the fans sucks the air from the atmosphere over the surface of the tubes in condenser . I made a sufficient length both before the condenser and after the fan.

Boundary conditions are

1.Before the condensor " Pressure Inlet BC (which is open to atmosphere) 2.After the condensor " Intake Fan 3.After the fan to sufficient length " Pressure outlet.

This is the way I applied the BC to solve this problem, when I tried for a Grid check , I got a warning in FLUENT stating that - GRID CHECK FAILED and error is Pressure inlet zone has two adjacent cell zones.

My question is Whether the applied BC's are right? How to fix this error and elaborate me why I am getting this error?

Thanks Wilson

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Old   January 17, 2007, 05:06
Default Re: How to fix this?
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Rajan
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Wilson, i suspect your pressure inlet zone may be the internal surface in the domain which is clear from the error "Pressure inlet zone has two adjacent cell zones". Try applying ur BC's only to the boundary zones ( which is attached to only one cell zone) and check!

Rgds, Rajan
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Old   January 17, 2007, 05:45
Default Re: How to fix this?
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Wilson
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Thanks Rajans.

But the surface where i applied the pressure inlet in the not there in inside my computational domain.

This surface is in the extreme left which didnt have any adjacent cell zones

Wilson
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Old   January 17, 2007, 12:33
Default Re: How to fix this?
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suijth
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Hi Wilson, Are you using 2d or 3d?

Grid check can be due to a negative cell volume or due to following a wrong convention

If 2d axisymmetric, you need to use x axis as the axis of rotation. and the domain should be above that, (ie on +y)

If 3d, check the skewness?

check if any spl convention is to be used for fan boundary, I think there isnt any.

- sujith
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Old   January 17, 2007, 14:35
Default Re: How to fix this?
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Tim
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I think your issue is with the intake fan boundary condition in the middle of the domain. An intake fan boundary condition is like a pressure-inlet boundary condition and is probably why FLUENT is reporting it as so.

Try changing this boundary condition to Fan and applying a fan curve, etc. and then re-checking your grid. That might work.
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Old   January 18, 2007, 00:16
Default Re: How to fix this?
  #6
Wilson
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Thanks for your response for both Tim & Sujith

Sujith

I am using 3D for my anlaysis.

Tim

I changed the Boundary conditions as what u suggested. It work out

Thanks a lot
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