[virendra_p]

hi friends,
this is very important for my thesis completion....please help me out!
i am implementing VOF method for standard pump-sump setup..i have realized single phase solution and i want to use this solution for intializing VOF setup.
is this possible in fluent? any suggestions

p.s. the domain for VOF setup is extended (addtional air doamian is constructed) so mesh sizes is different than the 1 phase setup

[praveen@cfd-online.com]

Hi Virendrasingh,

Yes it is possible to use the results of an earlier simulation (different mesh) as an initial value to the current simulation.

Follow below steps:

• Open previous case and data file in FLUENT
• File ----> Interpolate -----> Write Data
• Select the variables you want to use in new simulation, from the fields
• Save the interpolation file

• Open new case and data(initialized for air domain) file in FLUENT
• File -----> Read and Interpolate ---> Read
• Open the saved interpolation file

This should Work. All the Best!!!

Best Regards,
Praveen

[emmakateh]

Originally Posted by praveen@cfd-online.com

Hi Virendrasingh,

Yes it is possible to use the results of an earlier simulation (different mesh) as an initial value to the current simulation.

Follow below steps:

• Open previous case and data file in FLUENT
• File ----> Interpolate -----> Write Data
• Select the variables you want to use in new simulation, from the fields
• Save the interpolation file

• Open new case and data(initialized for air domain) file in FLUENT
• File -----> Read and Interpolate ---> Read
• Open the saved interpolation file

This should Work. All the Best!!!

Best Regards,
Praveen

When i follow these steps, I save the vof values from the old case and read them into the new case. I check the contour to make sure that the vof data read in properly and the profile looks accurate, but when I try to run the new case, i get floating point errors for all residual values. What am I doing wrong?


UPDATE: I was saving only vof phase-1 and it works if I save both vof phase-1 and vof phase-2

[Svetlana]

Originally Posted by emmakateh

When i follow these steps, I save the vof values from the old case and read them into the new case. I check the contour to make sure that the vof data read in properly and the profile looks accurate, but when I try to run the new case, i get floating point errors for all residual values. What am I doing wrong?


UPDATE: I was saving only vof phase-1 and it works if I save both vof phase-1 and vof phase-2

Is it all good now or do you require further advice?

[emmakateh]

My simulation is running now, but it is diverging quickly.

The csae is a spherical tank with 50% fill and low gravity and surface tension turned on. Once that reaches a steady state solution, I write the interpolation file with vof phase-1 and vof phase-2, initialize the case, and then read in the interpolation file so that all the momentum and velocities are 0. I turn on the source equations for UDF magnet (that has been verified to work in other cases) and run the simulation.

The case diverges around 0.2s. I am lowering my timestep to try to help it converge but I am not sure that is the right move. Is there something I am doing wrong or do you have any advice?