Q) I have a model of a vertical section through a probe design (see attached parasolid file for geometry). I have run a solution in CFX-5 (heat transfer only, no flow) and I seem to be having problems at some of the interfaces - some cells at the interfaces between the different regions show spurious temperatures lower than any of the temperatures set in the boundary conditions (see attached .png picture file for locations). Is this likely to be due to a problem with the mesh?


A) You are right, there is a low temperature which can be seen in Post and Fieldview.
If you go into Pre and the domain interface (which is created automatically when you have a 1-1 interface) and change the Connection Type to GGi this will then be fine.
For a solid-solid interface where the conductivity is very different for the two solids, this is done automatically. Your case is a solid and a fluid, but the fluid has no advection, so it is essentially acting as a solid with a low conductivity and is therefore causing the problem.
In summary, it should be fine to have automatic as the interface except in cases such as yours.


Q) I have a model of a vertical section through a probe design (see attached parasolid file for geometry). I have run a solution in CFX-5 (heat transfer only, no flow) and I seem to be having problems at some of the interfaces - some cells at the interfaces between the different regions show spurious temperatures lower than any of the temperatures set in the boundary conditions (see attached .png picture file for locations). Is this likely to be due to a problem with the mesh?


A) You are right, there is a low temperature which can be seen in Post and Fieldview.
If you go into Pre and the domain interface (which is created automatically when you have a 1-1 interface) and change the Connection Type to GGi this will then be fine.
For a solid-solid interface where the conductivity is very different for the two solids, this is done automatically. Your case is a solid and a fluid, but the fluid has no advection, so it is essentially acting as a solid with a low conductivity and is therefore causing the problem.
In summary, it should be fine to have automatic as the interface except in cases such as yours.





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