Learning Forum

[mamadreza9561]

Hi

Hi

I am simulating a 3d problem using polydata, there are diffrent free surfaces in the simulation some of the will contact during the simulation how can i concider this?

tthere is a fluid-fluid contact option for free surface boundary condition but this is inactive

many thanks

 

[prae]

Hi,

I think you must be having an incompatible setup for it to be greyed out in Classic Polyflow. I would recommend checking EX-125 Celuka example case and see how your problem is different from this example case that has fluid/fluid contact.

Also, why do you need fluid/fluid contact for your problem? Why can't you use multiple materials model to simulate your case?

Regards

[mamadreza9561]

Hi

Thank you for your response and suggestion.

I checked the EX-125 Celuka example case you mentioned. In that example, the fluid/fluid contact option is applied in a transient simulation. My current setup is steady-state, so this may explain why the option is greyed out in Classic Polyflow.

The reason I was considering fluid/fluid contact is that I need to account for the possible effect of contact in the model. However, based on the example, it seems that this feature may require a transient setup rather than a steady-state one which is wierd and i dont undrestant why it is just for trnasiant simulations

Regards,

[prae]

Hi

In Polyflow, all contact definition problems are transient because the application involes something like a preform, a film, or a cell zone that changes and deforms over time. So, it is understandable why fluid/fluid contact model is available with only with transient solver.

Also, if you say your problem can be modeled a steady state, then I (without much knowldege of your exact case or application) don't think it requires a contact definition setup on free surface. You  might need a model like multiple materials model, or a moving interface model etc. to study the contact between fluids or fluid zones...

Regards

[mamadreza9561]

HI,

thank you for your response, if I use multiple materials model, or a moving interface model there would be 2 main questions. First, i have actually one material how should i concider two material. second, when we models as multimaterial the contact will not be concidred in the software. 

[mamadreza9561]

just for clarification, in my steady simulation at the inlet the interfaces are not in contact and they are two seperate free surfaces as a result i cant use multimaterials and define interface between these interfaces. is there any uption to define for considering this?

[mamadreza9561]

i am stiil looking for fluid fluid interaction modelling in steady state simulations in polyflow, can you please help me with this ?