Learning Forum

[Kostil Mpirkin]

Hello, i am trying to simulate bar passing through a tube with a velocity of 30m/s. The bar has an initial temperature of 500C and water at 20C. I used dynamic mesh etc all works fine except the heat exchange. I cant create proper interfaces between the fluid and the solid because they dont touch initially. I am thinking maybe i should insert the bar just a few milimeters inside the fluid in order to create the interfaces, but if there is another way i will be glad to hear it.

[Rob]

One of the moving mesh rules is that you can't change the domain topology. So, extend the domain a bit so the bar starts out in the fluid. I'd also add a small amount of fluid zone to the bar so the heat transfer between fluid and bar isn't in the boundary of the moving mesh. 

[Kostil Mpirkin]

Thank you very much. I did this and i get and overlap error. Should i create a boolean and substract the solid from the fluid (this 1mm * 10mm rectangle inside the fluid), and i also get an error because the outlet of the fluid gets overlaped by the solid. 

[Rob]

Yes. There are other considerations for moving mesh, so have a look at layering in the examples in Help.