Sliding BC in ALE framework
Posted: Tue Sep 18, 2018 7:24 pm
Hello,
I was solving a problem with a deformable mesh and everything i it's ok with fixed boundaries but when I set sliding boundary for the mobile mesh (ialtyb(ifac) = igliss) the behavior is not what I expected when wall BC is used in the fluid.
In the documentation is mention that "ialtyb(ifac) = igliss: The mesh slides on corresponding face ifac. The normal component of mesh velocity is automatically set to 0. A homogeneous Neumann condition is automatically prescribed for the other components, as it's the case for 'Symmetry' fluid condition."
I shared the results of a simple test problem. It is a cylinder with an imposed movement in the x and y directions with a wall BC for the fluid. If I set a symmetry conditions for the fluid on all the sides of the box and a sliding conditions for the mobile mesh the vertex slide a no normal mesh velocity appears. But, if I set a wall condition for the fluid on all the sides of the box I get a rigid movement of the domain. I can't understand this change in the behavior when the fluid BC's are changed.
Link to a video with the test case
https://drive.google.com/open?id=1m2-mA ... LPsAsFotOc
Regards,
Luciano
I was solving a problem with a deformable mesh and everything i it's ok with fixed boundaries but when I set sliding boundary for the mobile mesh (ialtyb(ifac) = igliss) the behavior is not what I expected when wall BC is used in the fluid.
In the documentation is mention that "ialtyb(ifac) = igliss: The mesh slides on corresponding face ifac. The normal component of mesh velocity is automatically set to 0. A homogeneous Neumann condition is automatically prescribed for the other components, as it's the case for 'Symmetry' fluid condition."
I shared the results of a simple test problem. It is a cylinder with an imposed movement in the x and y directions with a wall BC for the fluid. If I set a symmetry conditions for the fluid on all the sides of the box and a sliding conditions for the mobile mesh the vertex slide a no normal mesh velocity appears. But, if I set a wall condition for the fluid on all the sides of the box I get a rigid movement of the domain. I can't understand this change in the behavior when the fluid BC's are changed.
Link to a video with the test case
https://drive.google.com/open?id=1m2-mA ... LPsAsFotOc
Regards,
Luciano