[aja1345]

Hi,


I am simulating a Shell and tube heat exchanger. But I face with the following error, why does this happen?






BC is as flollows:


Hot inlet: velocity 1 m/s- temperature 95 c



Hot outlet: 0 pa relative static pressure


Cold inlet: velocity 1 m/s- temperature 12 c


cold outlet: 0 pa relative static pressure








Thanks.

[evcelica]

Why is this whole thing one domain? It should be 2 separate domains?

Try changing the expert parameter it recommends to 1.2.

[aja1345]

Originally Posted by evcelica

Why is this whole thing one domain? It should be 2 separate domains?

Try changing the expert parameter it recommends to 1.2.

Thanks, you are right. Error solved but I faced with other problem. when I display streamlines in CFD-Post, I see that some stream lines inter to tube zone!!(please see the following picture). Am I right?























This could be due to wrong Interface because one interface is as follows:







and other Interface is as follows:








In setup, there is such message:









I am grateful that guide me in these cases.


Thanks.

[ghorrocks]

You appear to have set a fluid-fluid interface. So the fluid just goes straight through it, as you asked it too.

You probably either want to model the pipe as a solid domain to separate the two fluid domains, or use a thin wall to separate the two fluid domains but allow heat transfer.

[aja1345]

Originally Posted by ghorrocks

You appear to have set a fluid-fluid interface. So the fluid just goes straight through it, as you asked it too.

You probably either want to model the pipe as a solid domain to separate the two fluid domains, or use a thin wall to separate the two fluid domains but allow heat transfer.

Thanks your reply.


Yes, you are right. I want to model the pipe as a solid domain to separate the two fluid domains, or use a thin wall to separate the two fluid domains. But because I didn't create a cell zone as a solid domain(thickness of pipe), I want to use thin wall to separate the two fluid domains. How?


Thanks..

[Opaque]

In the snapshot of the interface you showed, go to the Additional Models tab.

Check the options for Mass and Momentum, and select as needed.