Learning Forum

[zwong32]

Hi all,

Hope all is well with you. I'm trying to implement 2 layering zones inside my simulation both of which are occurring at the same time. I get a SIGSEGV error with the message "free(): corrupted unsorted chunks." I don't think my UDF is a problem because I tested it on a simpler dynamic case, and didn't get this error. I think my error comes from how I specify the boundary conditions but I wanted to double check (see figure below). My question is: Is it possible for two touching zones to layer in opposite directions provided that the mesh interface between the two zones are stationary? Thank you again so much!

 

 

[Federico]

Hello, 

hard to tell without having the labels for each dynamic mesh zone on your screenshot. I assume that both walls translating to the left move together, right?

If so, this motion is possible. Horizontal interfaces should be set as Deforming. What is interior-tulip-border?

[zoelle.wong]

Apologies; there are 3 translating walls with the arrow indicating the direction (see below). Interior-Tulip-Border is the name of Zone 3 below in the figure below. 

 

By horizontal interfaces, do you mean Stationary Intf3 and Stationary Intf 4? 

[Federico]

I am referring to both walls moving towards the left. They need to be moving together for layering to work.

[Federico]

This is what I would suggest:

 

Set Zone 1 and Zone 3 with rigid body motion (the cell zones, not interior-faces). With this approach, you ensure that layering occurs away from the moving boundaries, which is better for the solver.

[zoelle.wong]

Ah ok - makes sense. Will follow up as questions arise, thank you for helping!

[Federico]

Let us know how it goes!