"The Analysis has stopped because the Solver has stopped unexpectedly"
I keep getting this message. I know I am new to cfd software but I really need some help
Hi, I am beyond panicked. I'm using Simulation CFD and the solver keeps crashing everytime before I can use it. Please please help. I don't know if there is something wrong with my model. I will send whatever files you need to help. This is due today. Please help
I don't even know which way I'm supposed to apply the volume, I chose to fill the void but now I'm not sure. I'm supposed to be modelling the drag and lift force on a ducted marine current .
Solved! Go to Solution.
Solved by Jon.Wilde. Go to Solution.
Hi,
I can try to help, short timeframe!
Thanks,
Jon
P.S. I was looking at attempt 2
Oh thank you so much, I'll fix the inlet and outlet issues.
Yes the blades are meant to be rotating but I don't know how, I tried using the motion tab but when I went to preview, nothing happened. I am supposed to optimise the performance of a marine current turbine by varying multiple parameters. I chose to vary the blade type and the angle of attack. I have no idea what output I should be looking for as I have never ever used cfd software before but I am definitely willing to learn.
No worries.
OK, this is not a study you are going to be able to run in one day.
You need a rotating region around the fan - check out the fan/pump guide.
There it lots on Autodesk Knowledge Network also.
Thanks,
Jon
Hey, I'm still getting the same message.
I added the extrusion, I noticed the element count was reduce but I am still getting the same error. I'm truly lost
Well for one you have suppressed the fluid from the mesh 🙂
The size is spot on though.
There is still no rotating region (RR) around the impeller, this is what you need to cause the rotation. This will need to be drawn in CAD, it needs to encompass the impeller and the OD should be 1/2 way between the tips and the solid surfaces of the wall. Same goes for the surfaces either end of the axis.
Once you have this, give everything a 0.5 mesh refinement, good starting point for this model.
Then ensure the outer surfaces of the RR have a uniform mesh, as they will be passing past the static elements of the water.
This will need to be run transiently, all the instructions are in the link I sent before.
Thanks,
Jon
Hi Jon,
Me again. I am getting the same error message. I created the rotating region. I made it uniform. It's not touching any solid surfaces, net even the axis infront and behind. I set the mesh refinement at 0.5 but the number of elements was well over 4 million. I assumed this was the cause of the error so I decided to leave the refinement as one for the fluid. I'm not sure what else to do. I really tried to figure it out. I double checked the bodies, I hope that I haven't confused them yet again but they, as well, seem correct. Please any extra help would be appreciated. And I went through every thing.
Hi Kaye,
Okay, I changed everything as you said and I'm still getting the same warning message. I'm really stumped on this one.
Hi Kaye,
It is running fine here, although the mesh is too coarse.
Are you running from a local drive?
Okay I found the problem there, it was loaded in my Google Drive folder. So I took it out and it ran. Thank you so much Jon. Thank you thank you thank you
No problem, it is what we are here for, although perhaps not usually quite so quickly 🙂
Keep that mesh nice and refined and you should be OK here.
Best of luck with it
Jon
Okay, I'm a little bit confused about some of this data. I really want to get some data on the drag force, lift force, angular momentum and Torque on the turbine. How do I analyse this?
And can I run the simulation for multiple designs simultaneously?
Once it has run (and I suggest you try a further refined mesh to ensure you are fully mesh independent) you can get the RR results from Results -> Review -> Rotating Region Results.
You can run for multiple designs if you have Sim 360 or multiple licences. Clone the design and then update the new one from CAD, which will change the geometry leaving other settings the same. Then use the Solver Manager from within the interface to run a batch of them.
Okay so now this is happening. It starts to run and then it stops. I think its a result of my reducing the mesh siz but i'm not sure.
I would guess it is because you have suppressed the RR from the mesh.
When things like this happen, just work through all the steps to be sure everything is OK
Oh makes sense. *shame*
On another note though, do I leave it at 10 inner iterations and 10 steps to run? And is the 0.1s a good step?
Try it and see.
Use 3 inner iterations (10 is likely too many) and run for 1000's of timesteps. Start with 2000 and see what the convergence looks like.
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