Autodesk Simulation CFD

[#1]

I am having error telling me that:

"The analysis has stopped because the solver has exited unexpectedly"

I attached .cfz file, because I am getting: "Account Is Not Linked to an Active Subscription Contract" on technical support page.

[#2]

Few pointers for you:

1) Suppress all unnecessary solid parts from the mesh

2) Extend inlets and outlets 3x dia inlet, 5x dia outlet - helps with convergence and accuracy

3) All your materals are steel - you need some fluid

4) You have no outlet, assign a p=0 on the outlet surface

[#3]

OK, thanks for pointers, Comment to your point 1: there is some parts that are created by CFD -can I suppress also that ones? Comment to your point 2: Can't do - this is the model on which I wan't to do CFD. Comment to your point 3: I guest I need to define interior of duct as air (volume). Thanks again will try reparing model in few hours.... Thanks, KLemen

[#4]

Hi KLemen,

1) You can suppress the parts that CFD creates if they are not necessary, yes. I would suppress everything that isn't a fluid unless you are looking at heat transfer through solids

2) Your choice entirely on extending the inlet (this looks important to me, the outlet looks like it would be OK) but this would be our recommendation

3) Yes, whatever your fluid medium happens to be

[#5]

Hi,

I just tried suggestions you gave me, and when I try to merge edges in Geometry tools, CFD crashes - it seems like bug.

Please see attached picture.

[#6]

The issue here is likely that you have a zero angle where the outlet meets the cylinder at the bottom, move this inwards a little and it should be OK.

I wouldn't have though that the geometry tools would be needed on this model though, looks pretty clean. I would just skip it and be sure to apply a better mesh than the default - which looks too coarse. 

Works fine, although I do wish you would take our advise and extend the inlet to 3x diameter, it looks rather odd as is, the flow is not properly developed before it enters the unit.

[#7]

I still have problem - solver crashes everytime I run "Solve". I also tried with finer mesh.

Is there any additional info what disturbs solving proces?

Where is some additional info that could point me to what's wrong?

Some solver logs maybe?

Here if my CFZ file.

Can you help please?

Thank you for your effort...

[#8]

Hi, 

This will work OK but your meshing needs some work, the blue parts are suppressed ,the grey will be meshed so:

1) Suppress EVERYTHING

2) Resume just the air (currently you have done the opposite)

Try just with the auto mesh, although you will need to refine it. The inlet looks far better now. Check out the manual and the Wiki site for meshing tips regarding refining.

[#9]

Hi Thanks for fast reply,

finally I made progress - obviously supressing everything except air did the trick.

Thank you

[#10]

Good to know. You should be able to mesh the other parts also, if you were interested in heat transfer. The issue you were having was that you had most of the air parts suppresed so nothing could actually happen when you hit solve.