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[Deepak <question683336@xxxxxxxxxxxxxxxxxxxxx>]

Question #683336 on Yade changed:
https://answers.launchpad.net/yade/+question/683336

Deepak proposed the following answer:
 I've noticed that the max Courant No. is 3.7703, that doesn't look
good...have you tried decreasing the time step in Yade?

On Fri, Sep 13, 2019 at 11:36 AM Deepak Kn <deepak.kn1990@xxxxxxxxx>
wrote:

> Hi,
> I need to have a look at the case, boundary conditions and things to
> identify why this happens (my best bet is bad physics/numerical settings),
> paraFoam can be used to view parallel cases, did you have a look into the
> openfoam documentation/coupling documentation? The methods to post process
> parallel
> cases are there ..
>
> https://cfd.direct/openfoam/user-guide/v6-paraview/
> https://yade-dem.org/doc/FoamCoupling.html#post-processing
>
> On Fri, Sep 13, 2019 at 11:09 AM Anqi H <
> question683336@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Question #683336 on Yade changed:
>> https://answers.launchpad.net/yade/+question/683336
>>
>>     Status: Answered => Open
>>
>> Anqi H is still having a problem:
>> Hi Deepak,
>>
>> I'm running the same simulation with icoFoam for 0.05s, the particles
>> are defined in fluidCouplingIDList and dynamic is disabled. The fluid
>> case without the particles converges in openFoam, but after the
>> particles are included, the simulation hangs after 0.01275s. I've been
>> having trouble understanding why the program hangs here as the courant
>> number is smaller than 0.5. The terminal output is copied to this post.
>> Another question is about inspecting p,U properties of the fluid cells,
>> since they are saved under two directories processor0,1, does it mean
>> paraFoam cannot be used in this case? Thank you.
>>
>> Time = 0.01275
>>
>> Courant Number mean: 0.142852 max: 3.7703
>> smoothSolver:  Solving for Ux, Initial residual = 0.560774, Final
>> residual = 7.25301e-06, No Iterations 13
>> smoothSolver:  Solving for Uy, Initial residual = 0.210176, Final
>> residual = 8.97415e-06, No Iterations 10
>> smoothSolver:  Solving for Uz, Initial residual = 0.580007, Final
>> residual = 8.33788e-06, No Iterations 13
>> DICPCG:  Solving for p, Initial residual = 0.87801, Final residual =
>> 0.0268803, No Iterations 11
>> DICPCG:  Solving for p, Initial residual = 0.0229963, Final residual =
>> 0.00113944, No Iterations 9
>> DICPCG:  Solving for p, Initial residual = 0.00111865, Final residual =
>> 4.86087e-05, No Iterations 11
>> time step continuity errors : sum local = 2.63805e-06, global =
>> -2.6854e-07, cumulative = 2.84037e-06
>> DICPCG:  Solving for p, Initial residual = 0.216622, Final residual =
>> 0.00789831, No Iterations 10
>> DICPCG:  Solving for p, Initial residual = 0.00936633, Final residual =
>> 0.000371535, No Iterations 11
>> DICPCG:  Solving for p, Initial residual = 0.000378234, Final residual =
>> 9.57322e-07, No Iterations 17
>> time step continuity errors : sum local = 3.7861e-08, global =
>> 3.12631e-09, cumulative = 2.8435e-06
>> ExecutionTime = 99.51 s  ClockTime = 100 s
>>
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