16 Replies Latest reply on Feb 6, 2014 12:26 AM by Tim Webb

    Flow simulation solver "stops" while still in 'Calculation' mode

    Tim Webb

      Hi everyone.

       

      Listen I've got a really odd (and frustrating) problem with Flow. I am usually on the forums in the EPDM section so with the community spirit out here, thought I'd venture out with a Flow Simulation problem I've been experiencing that has me stumped. Oh, my VAR did recommend an RX but I have not done that yet...

       

      I have done quite a bit of research and tried numerous things over the last 6 weeks and 80 simulations but nothing has resolved the issue. The problem is this:

      During both steady state and time based simulations, the solver will randomly just stop, like the solver is sleeping. The menu/toolbar buttons are all greyed out. No activity on the Windows Task Manager but the Solver ribbon says "Calculation". No error boxes, nothing in the Windows event viewer, no warnings in the flow log, and on and on and on.

       

      I kick off a simulation in the morning before leaving for work and when I return, it's just sitting there, not calculating.

       

      Usually see "Calculation time left: 2:49:30"...or something like that with "Last iteration finished at: 13:30.." yet it is currently 16:45 when I get home.

       

      Each of the simulations are internal flow with the setting "exclude cavities without flow conditions" checked. Each simulation runs approx 6-8hours and each iteration is only about 30s to 60s. Thermal condution in solids is checked and working fluid is water. These are simple simulations relative to ones I've run in the past that ran for 36hrs and used a few other computers to remotely solve. Soooo....this kinda ticks me off.

       

      This thread describes my issue "very closely" however cloning the project did not resolve the issue.

      https://forum.solidworks.com/message/114931

       

      SolidWorks and the Solver don't crash like this guy's but this sort of does describe what I'm seeing on my solver window (again, with only one simulation running at a time.

      https://forum.solidworks.com/message/382384

       

      Tried enabling OpenGL as recommended in these two posts but the solver still hung during calculation with 1hr 30min left.

      OpenGL

      https://forum.solidworks.com/message/366668

      OpenGL

      https://forum.solidworks.com/message/357860

       

      Files are stored on a local hard drive, no network activity during simulation as Jared notes in this post.

      https://forum.solidworks.com/message/114960#114960

       

      Checked the temporary file creation to see if that was possibly filling the hard drive or if permissions weren't granted but no luck there either.

      https://forum.solidworks.com/message/369609

       

      Reboot before each simulation.

       

      Here's my system configuration:

       

      SolidWorks 2013 SP4.0 (activation)

      Dell Precision T3600

      4 Core Xeon cpu E5-1607 @3.0ghz

      Win7 64

      Nvidia Quadro K2000D 2Gb GDDR5 PNY - Driver 9.18.13.1115

      16gb RAM RDIMM

      500GB HDD

       

      Thanks in advance,

      Tim CEPA

      http://www.equivaq.com

        • Re: Flow simulation solver "stops" while still in 'Calculation' mode
          Tim Webb

          Update:

          Started another simulation last night.

           

          Here is the status this morning showing the solver and it appears to be still actively solving.

          solver at 929 iterations 10-21-2013 7-24-40 AM.jpg

           

          I will upload another screen shot later today if/when it either stops calculating or completes the simulation.

          • Re: Flow simulation solver "stops" while still in 'Calculation' mode
            Jared Conway

            did this ever work on this computer? if it did, any idea on when it stopped?

             

            is this happening on all files? what happens if you have a really simple part/assy with the same physics and similar solve time? does it work?

             

            did the problem run without issue on the VAR computer?

             

            trying to narrow down if this is a file issue, setup issue, software issue or computer issue.

              • Re: Flow simulation solver "stops" while still in 'Calculation' mode
                Tim Webb

                Sorry Jared, marked it as correct answer then realized that wasn't the reply button.

                 

                Jared Conway wrote:

                 

                did this ever work on this computer? if it did, any idea on when it stopped? Yes it did work ~20% of the time and it is intermittent, no ideas on why it has begun stopping

                 

                is this happening on all files? Yes what happens if you have a really simple part/assy with the same physics and similar solve time? does it work? Tried that too, began happening on a simple assembly so I simplified the assembly down to a simple part. No, it stops on that too.

                 

                did the problem run without issue on the VAR computer? Unfortunately due to the highly proprietary nature of this product development, I am unable to allow the VAR to run the simulation.

                 

                trying to narrow down if this is a file issue, setup issue, software issue or computer issue. Thank you, I watch the forums and have noticed you are a heavy on here so was really hoping you would take notice. So thanks for stepping in.

                Yes this simulation has run on this computer in the beginning no problems. It seems to have worked on ~15-20 of the 82 simulations I've run now.

                 

                1. Ran the F12 diagnostics at boot time to see if the system detects any problems and the only one was the hard drive controller was not recognized. Talked with Dell (at length) and they claim that is common and not a problem and that it is probably SolidWorks related.
                2. Ran Memtest86 on the RAM to see if that was a problem because I purchased the RAM from Dell after purchasing the system 8/26 and installed it myself. Initially a problem was reported about 3 weeks ago but reseated the RAM ande NO problems reported since then but the behavior is still there.
                3. Disabled UAC
                4. Disabled power plan so the system is "always on"

                 

                My last ditch is to upgrade to SW2014 but *really* need to get off SP0 and preferably at least SP2.

                 

                Jared I appreciate the thoughts.

                 

                I'll also update when I get back to my home office on how this simulation is running or if it stops.