[daniebae]

Dear all,

I try to set up an Imprint Simulation. Means, a Pattern adept a Pressure on the top and will be pressed into a liquid polymer, which is placed on a plate.

I tried to set this all up with Workbench. I followed the Tutorial #Oscillating Plate with Two-Way Fluid-Structure Interaction#.

In ANSYS MECHANICAL
- A simple Hex mesh for the pattern and the plate
- a load applied on the top of the pattern
- solid fluid interaction between pattern and liquid polymer
- solid fluid interaction between liquid polymer and plate

in CFX:
- Material with Non-Newtonian model Carreau Yasuda = Liquid Polystyrene
- Symmetry Boundary conditions at each open wall
- Boundaries for MultiField Interactions on the top and bottom of the polymer ( as in the tutorial)

All properties set as the tutorial, so the ANSYS SOLVER gives out the ERROR:
-----------------------
*** WARNING *** CP = 51.406 TIME= 14:11:25
Material number 4 (used by element 34186 ) should normally have at
least one MP or one TB type command associated with it. Output of
energy by material may not be available.



*** WARNING *** CP = 2839.312 TIME= 14:35:18
The unconverged solution (identified as time 0.1 substep 999999) is
output for analysis debug purposes. Results should not be used for
any other purpose.



*** ERROR *** CP = 2839.281 TIME= 14:35:18
One or more elements have become highly distorted. Excessive
distortion of elements is usually a symptom indicating the need for
corrective action elsewhere. Try ramping the load up instead of step
applying the load (KBC,1). You may need to improve your mesh to
obtain elements with better aspect ratios. Also consider the behavior
of materials, contact pairs, and/or constraint equations. If this
message appears in the first iteration of first substep, be sure to
run shape checking of elements.



And the CFX SOLVER givs out:
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| CFX encountered the error: Read. Fatal error occurred when reque- |
| sting Total Mesh Displacement for bottom.


--------------------------


-- I tried to improve the mesh, I tested with other materials Newtonian fluids. I don’t know if there are any other constrains needed.

The surprising thing is, that when I add a Displacement instead of a Pressure to the Pattern, the simulation runs! As I want to do a pressure study, this do not help me that much.


Does someone have a tipp or an idea what i could do ?