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Contributor
lopexergy
Posts: 18
Registered: ‎08-27-2009

INTERNAL FLUID CONSIDERATIONS

567 Views, 7 Replies
08-16-2011 09:10 AM

Hi, I have followed the considerations to build a HEat Exchanger using Inventor, then passed to Simulation for create the two internal fluid systems.

 

When imported have knit the surface too.

 

I Don't know what to do with the model to build correctly the internal fluids.

 

Any idea?

 

See heat exchanger attached

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Employee
derrek.cooper
Posts: 65
Registered: ‎04-06-2011

Re: INTERNAL FLUID CONSIDERATIONS

08-16-2011 09:26 AM in reply to: lopexergy

hello.. the easiest way to do it is to create "caps" on all of the openings. You can either do it as a multi-bodied part or as an assy. Just dont merge them with the heat exchanger. When you launch into CFD, it will automatically create the fluid part. The idea is that you want to create a water-tight model and CFD will "fill the void"

 

here is an image of a typical "cap"

 

8-16-2011 12-17-19 PM.png

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Contributor
lopexergy
Posts: 18
Registered: ‎08-27-2009

Re: INTERNAL FLUID CONSIDERATIONS

08-17-2011 12:02 AM in reply to: derrek.cooper

Thanks for you answer, then you say:

 

1. Fill all the inlet and oulet pipe with cap.

2. This "CAP" is like a solid (in the same ipt) that seal the pipe.

3. THen open into A.Simulation.

4. Generate the internal fluid.

 

The CAP function is to seal all the inlet and oulet that I don't select at the Simulation when I define the internal fluid?

 

For example at this design we have 3 pipes where are the inlet of fluid, I put this CAP into two and the other one is free??

 

Please tell me if I have understand your message.

 

 

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Employee
derrek.cooper
Posts: 65
Registered: ‎04-06-2011

Re: INTERNAL FLUID CONSIDERATIONS

08-17-2011 05:51 AM in reply to: lopexergy

Yes.. But, often the caps are used as the part of the fluid space. Often times in CFD, an extension is used for the fluid at the inlet and outlet. to place a boundary condition away from the actual inlet/outlet.

 

Take a look at the attached. If this isn't clear, you may want to contact support and they can walk you through it.

 

derrek

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Contributor
lopexergy
Posts: 18
Registered: ‎08-27-2009

Re: INTERNAL FLUID CONSIDERATIONS

08-19-2011 07:15 AM in reply to: derrek.cooper

Thanks Derrek

 

Now I'm really lost.

 

If I put those caps, then at ASim, I need to define the internal fluid, the software asks me two kind of surface, the interior surface (I pick the interior of a pipe) and the bounding surface (I pick the cross sectional of the pipes that are involved with the fluid)

 

I understand about the extra fluid for a boundary condition outside, but, With this caps, how I define that?

 

Thanks

 

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Employee
derrek.cooper
Posts: 65
Registered: ‎04-06-2011

Re: INTERNAL FLUID CONSIDERATIONS

08-19-2011 10:50 AM in reply to: lopexergy

there may be some miscommunication on my part. Are you using Simulation Multiphysics or Simulation CFD (former CFdesign)? They are similar but very different products and workflows for now.

 

I am explaining the procedure for Simulation CFD (CFdesign). Where are you located? May be worth putting you in touch with the support team and they can walk you through the process.

 

If you are using Multiphysics, I can put you in touch with guys on that team to help,.

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Contributor
lopexergy
Posts: 18
Registered: ‎08-27-2009

Re: INTERNAL FLUID CONSIDERATIONS

08-19-2011 02:52 PM in reply to: derrek.cooper

Uau, don't tell me.

 

I'm working with Autodesk Multiphysics 2012.

 

That's why I do not understand you.

 

 

Do you know who could help me?

 

Regards

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Employee
Joey.X
Posts: 259
Registered: ‎06-14-2010

Re: INTERNAL FLUID CONSIDERATIONS

08-24-2011 08:31 PM in reply to: lopexergy

In Simulation Multiphysics, you can do internal fluid part generation as well, refer to help which has detail descriptions.

Jianhui Xie, Ph.D
Principal Engineer
MFG-Digital Simulation
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