can somebody explain what is undefined criteria means?
I was running a flow simulation, when this warning shows at info tab. can somebody explain this?
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Re: can somebody explain what is undefined criteria means?
was it a new simulation or a clone? I could see if you deleted a face/surface/etc that was previously defined it might consider it "undefined criteria".
I would start by rebuilding and making sure it doesn't highlight any of the goals. Then edit each one at what you've selected vs the model (i.e. velocity and fluid concentration not applied to solids, etc)
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Re: can somebody explain what is undefined criteria means?
Sir, its a new simulation. iam new on solidworks, i just watched online tutorials so pardon me, if i barely understand. I used the force rebuild on the model, and to make sure, i deleted the existing simulation and create a new one, but again the error shows, i deleted the goals i have selected before butstill the errors occurs.
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Re: can somebody explain what is undefined criteria means?
Will the simulation run without the goals? (you can just suppress them instead of deleting.) The "abnormal termination" error sounds like a different issue, there may be a more fundamental underlying problem with the model.
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Re: can somebody explain what is undefined criteria means?
nope, it shows the "undefined criteria" error, but if i suppress the rotating region it runs, it just stops with the abnormal termination. yes, i thinks so, but i don't know wheres the root of the errors.
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Re: can somebody explain what is undefined criteria means?
i think my rotating region caused this, i tried to suppress my rotating regions, and the "undefined criteria" doesn't shows, but a Mesh generation terminated now shows.
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Re: can somebody explain what is undefined criteria means?
A criteria (less than by default that cannot be changed) must be assigned to each Goal to be checked for convergence. The criteria is either "auto" (not recommended because the auto-criteria is too week and the CFD runs stop premature) or user specified absolute value of the goal changed over the checked interval. Surprisingly to me, in spite of my enhancement suggestion many years ago, there is still no option to specify %change over the checked interval.
You have probably have not entered a meaningful User Specified value or the field was left black after selecting a User value option. -
Re: can somebody explain what is undefined criteria means?
if you want to check out the model here it is. if there's someone knows what to do please help.
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Re: can somebody explain what is undefined criteria means?
I don't know what level of detail you started with, but the model you posted is fairly high resolution. I simplified it by quite a bit, deleting the fan models and replacing them with surfaces for "External fan" boundary conditions. I used a couple of fans from my engineering data base. Of course in your case you should upload your own application fans and use those instead. I also switched the project to an internal flow simulation.
Also, there didn't seem to be any heat sources, so I just added 18W to your test cell. No particular reason I chose that number, just wanted to see how the heat transfer would solve.
After I did all of this, the project meshed and solved just fine. I suspect those fan models may have been a part of the problem, though I'm not sure what it could have been.
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Re: can somebody explain what is undefined criteria means?
Thank you sir. i change the fan! and now its working.
Sir, i used the "initial condition" for setting the "heat source" of my model, is that okay? or should i instead use the "volume source".P.S. i cant view the flow simulation. Future version it says.
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Re: can somebody explain what is undefined criteria means?
Yeah, I'm using 2015 version, sorry.
Where is the heat in your problem coming from? If it's only from one part in the assembly, you should use a "volume source".
Unless that is you're just testing how long it takes the system to cool down to ambient after everything is shut off. In that case it would be OK to set your initial temperature and then do a time-dependant study.
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Re: can somebody explain what is undefined criteria means?
"Undefined Goal Criteria" could occur only if the Goal-Criteria (not the Goal it self ) is undefined.
if the Goal is undefined the Solver won't start at all. At least that is the case up to SW2014 - the latest version I have.
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