Learning Forum

[GuillaumeTHIRIET]

Good afternoon guys,

I am currently working on a case where I have to apply radiation on thin barrels surrounding cylindrical solids. These barrels are located on a box. Several faces of the box are submitted to a heat flux.

• Configuration

- Four solids coated by a thin steel sheet ( => The solid fill a barrel) 

- The Four solids are placed within a box 

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Box and Barrels repartition

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I want to implement Surface to Surface radiation between these cylindrical packages and the internal faces of the box

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Cut view of a cylindrical barrel with its cylindrical solid content)

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• Results

When I select all the internal faces of the box with Surface to Surface Radiation ==> Calculation goes fine

When I select all the internal faces of the box + The external surface of one barrel with Surface to Surface Radiation ==> Calculation goes fine

When I select all the internal faces of the box + The external surface of two barrels with Surface to Surface Radiation ==> The model is stuck at "*Building mathematical model" and my RAM is litterally skyrocketed till the computer crashs (I have 16 Go RAM) 

When I suppress the barrel (The thin steel sheet) (Just remains the cylindrical contents) and I select all the internal faces of the box + The external surface of two contents with Surface to Surface Radiation ==> Calculation goes fine

 

The contacts between barrels and the lower wall of the box are well established as well as the contacts between the Barrels and the contents.

I have to precise that I am applying a Tast (Adiabatic Surface Temperature) on SURF152 nodes which is varying across time. When I supress this "special" boundary condition to simply apply a temperature / heat flow / Heat flux / ... condition ==> Calculation goes fine

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• What I do not understand

Why my RAM skyrockets in this particular case ?

Does anyone already get this "weird" issue of the RAM skyrocketing till the maximum of the computer capacity while applying radiation on barrels containing cylindrical packages ?

(Or in an other case, Does anyone already get some issues with the RAM skyrocketing whatever the boundary condition applied)

I thank you very much for your attention and your help.

Yours faithfully

Guillaume THIRIET

 

[Sandeep Medikonda]

What version of ANSYS are you using? Are you running this in Shared Memory or Distributed?

As a general suggestion, I would recommend upgrading to the latest one (2019R2) as there are often improvements made to the code as far as memory management goes.

[GuillaumeTHIRIET]

Good morning Sir,

I am using 2019R1 which is almost the last version. i do not think that the problem can come from this point but maybe I am wrong as I am pretty new to ANSYS. Then, I think I am running it in Distributed but I amù not sure. How can I check that ?

Thank you very much for your answer.

Yours faithfully

[Sandeep Medikonda]

Tools>Solver Process Settings>Advanced try unchecking Distributed Solve