topic Re: Solver Quit Unexpectedly in CFD Forum

Solver Quit Unexpectedly

Anonymous — Sun, 12 Nov 2017 17:55:11 GMT

Getting slightly frustrated here...

All of a sudden CFD just stopped being able to run my solves. I'm doing all setup in the exact same way, tried a few different models that worked previously, there's like 100 GBs of freespace on the computer. I don't get it.

Mesher process started...

Meshing override: Tets or triangle elements enabled for boundary layer.

Loading model...

Loading mesh sizes and constraints...

Meshing...

Surface meshing... generating surface mesh

Surface meshing... smoothing surface mesh

Volume meshing... creating volume mesh

Volume meshing... optimizing volume mesh

Volume meshing... smoothing volume mesh

Mesh contains 311142 nodes and 1688707 elements.

Performing mesh quality check...

Saving mesh...

Meshing completed.

Updating model database...

Model database updated.

Updating mesh database...

Mesh database updated.

Building solver model file...

Solver file written.

Initializing ...

Control file processing complete

Check Out basic License: Successful

Authorization verified

Processing input ...

Mesh input complete

Processing results input ...

Results input complete

Processing BC input ...

Computing restart BC data ...

Calculating BC data structures ...

Calculate wall distance for 148239 fluid nodes

Wall distance calculation done in (0 + 1) seconds. Max distance = 3.11078

BC data structures complete and saved

Analysis Initialization Complete

Input processing complete

** FINITE ELEMENT SUMMARY FOLLOWS...

338683 Total Nodes, 148239 Fluid Nodes , 190444 Solid Nodes

1688707 Total Elements, 778704 Fluid Elements , 910003 Solid Elements

3 Inlets 1 Outlets 0 Unknowns

*********** ANALYSIS STARTED ***********

CFD2 launch using 1 machine, 1 processes, and 2 cores was unsuccessful

Re: Solver Quit Unexpectedly

matt.bemis — Sun, 12 Nov 2017 18:53:24 GMT

Hi @Anonymous,

Thanks for reaching out to us on the forums! It looks like you set up the simulation to use the CFD2 solver (Scalable Solver). I suggest just using the standard solver. Just select "MyComputer" from the solve dialogue box. The CFD2 Solver still has some limitations and may not be capable of performing the simulation you have set up. It's also built for computers with large core counts; considering your computer has 2 cores it's best to just use our standard classical solver.

Thanks,

Re: Solver Quit Unexpectedly

Anonymous — Sun, 12 Nov 2017 20:47:08 GMT

Hi Matt,

Thanks for the response. Just seems strange that it was working completely fine, and then without changing anything, continued to fail.

Also, saw the posting regarding the My Computer switch... but my Solver Computers menu looks slightly different (see attached), so please advise with what you believe is the best/correct setting.

Many thanks,

D
solver computers

Re: Solver Quit Unexpectedly

matt.bemis — Sun, 12 Nov 2017 22:17:43 GMT

@Anonymous

Huh, someone must have played with the default settings a bit there. Definitely deselect "Scalable Solver" option for "My Computer". Once this is done try to run your simulation. If the solver still exits then there is probably something wrong with your model setup.

Again, the best setup is "My Computer" with Use Cluster and Scalable Solver deselected.

Thanks,

Re: Solver Quit Unexpectedly

Anonymous — Mon, 13 Nov 2017 13:01:29 GMT

Still failing unexpectedly. Also, it does not make sense that it's an issue with the model, as it's the same model I've been using for the past two weeks...

Re: Solver Quit Unexpectedly

David.Short. — Mon, 13 Nov 2017 13:16:08 GMT

Hi @Anonymous,

Can you please provide your .cfz file (either attach here or by private message) and we can have a look.

Thanks,

DAvid

Re: Solver Quit Unexpectedly

matt.bemis — Mon, 13 Nov 2017 13:53:15 GMT

Hi @Anonymous,

Ok thanks for the update. Have you seen this article on why this message appears? It contains 6 of the most common reasons for the solver exit, but honestly this error can occur for probably hundreds of reasons. You said the simulation has been running in the past; what changed between then and now? Where are you saving the project? It needs to be saved to your local disk drive (ie C:, D:), and the working project folder can't my synced with a Box account or anything like that.

If you are indeed saving to your local C drive, I would try running a tutorial model. I usually use the nozzle model and just put a random velocity and a 0 pressure outlet on it. It'll take about 5 mins to run and then you will clearly know whether this issue is model specific or not.

Thanks,

Re: Solver Quit Unexpectedly

Anonymous — Fri, 17 Nov 2017 11:50:39 GMT

Seemed to be a combination of issues with the Solver selection as well as VPN. I didn't figure out the exact intricacies of the VPN issue, but I'm now running with all network connections disabled (wifi, etc.) and the My Computer computer solvers selected, and all again seems to be working fine.

Re: Solver Quit Unexpectedly

matt.bemis — Fri, 17 Nov 2017 15:22:57 GMT

@Anonymous Glad things are working now. Best of lucking with the modeling.