Hello, in my previous thread i had a problem with creating a conjugate heat transfer simulation, until i was pointed out the fact that i was using stl. After some read i realised, this info was at the start of the CHT tuturial but i have not seen it.
This is my simulation: [Battery cooling channel | SimScale
Now i was happy for a short period of time with simulating my battery cooler design. I added a second solid body to make a absolute heat generating source of 1000 Watt and then i post processed the data. The mesh consists of 1.2m cells and it was quite fast to solve.
I now made 2 changes, First was to use a counter flow design to decrease the temperature differences on the battery :
and the improvement was good, only on two corners i was not happy with the temperature distribution.
So i changed the flow bend a bit. Instead of a constant 180 degree arc, i made 2 bends with one short straight line:
I draw in fusion 360 and export it in .iam and .ipt. before the change i had 29 contacts and after there are 33 contacts. i counted them and all seems fine. But it only works with 29 contacts. Also if i clear the additional solid plate for heat generation, there are 32 contacts and if i want to start the simulation it gives me reasonable numbers. (1.2 million cells, some 1h time or so to simulate)
The problem, as far as i can tell, is somehow linked to the additional solid plate which i created to make a absolute heat source with a power of 1000 Watts. But then, in the first simulation with 29 contacts, i did it with this solid plate and it worked.
I cannot change the contact and if i would know a better way to create a heat source with CHT simulation, i would be glad.
Is there a way to define a face with a heat flux as a work arround for it?
With the change i cannot simulate anymore as the mesh has arround 10 million cells and the simulation exceeds the maximum simulation time.
I also tried changing the mesh settings… but the few settings did not change the behaviour.
I also tried offsetting the solid plate, but then i get error messages because of interference problems.
These feels like another very basic problem to me, my next step is to try to change the solid plate design so that there is a border on the edges.
Furthermore, there seems to be a bug in CHT, i can generate this error:
The simulation domain only consists of a single region. For a successful conjugate heat transfer simulation at least two connected regions are required. Find out more here.
Even if there are two regions. Not sure what this means exactly, but if i delete it and make new it will work again.
Does someone have a suggestion what i do not see here?