Steady-state stokes flow simulation

Prabin Pradhananga_22497
Prabin Pradhananga_22497 Altair Community Member
edited August 6 in Community Q&A

Hi experts,

 

I was looking at simulating Stokes' flow in AcuSolve. I went through the underlying theory and found that it is a simplification of NS equation where there's no convective term and Re of the flow is very low (close to 0). In this case, I was wondering is there any method that can be applied to solve non-dimensional steady-state Stokes' flow? I am thinking to either use a very low density or very high viscosity (in both cases inertial force is negligible in comparison to the viscous force and hence Re-->0). Is this the correct way of simulation? Or is there any way I can select stokes flow directly through the drop-down list?

 

Thanks.

Tagged:

Answers

  • acupro
    acupro
    Altair Employee
    edited August 5

    I believe the team made the decision to remove the Stokes option from the GUI tools, with the recommendation just to use the standard N-S solver even for cases where Stokes might be applicable.

  • Prabin Pradhananga_22497
    Prabin Pradhananga_22497 Altair Community Member
    edited August 6
    acupro_21778 said:

    I believe the team made the decision to remove the Stokes option from the GUI tools, with the recommendation just to use the standard N-S solver even for cases where Stokes might be applicable.

    I tried by modifying the input file directly. Instead of navier_stokes, I used stokes option and it worked fine. My question here is does this do the right thing I want? Will it work correctly for low Re? Also the documentation says, stokes option is for time dependent stokes flow. With the analysis type to static, will it solve time-independent (steady) stokes flow?

    image

  • acupro
    acupro
    Altair Employee
    edited August 6
    Prabin Pradhananga_22497 said:

    I tried by modifying the input file directly. Instead of navier_stokes, I used stokes option and it worked fine. My question here is does this do the right thing I want? Will it work correctly for low Re? Also the documentation says, stokes option is for time dependent stokes flow. With the analysis type to static, will it solve time-independent (steady) stokes flow?

    image

    The stokes option has not been thoroughly tested/validated - thus the recommendation to stay with navier_stokes.  If you are satisfied with the performance/results - yes, stokes should also work with steady-state/static.  (There is still a time step - just very large as the time-accurate path to final result is not necessary, same as with navier_stokes.)

Categories