FSI in Ansys Workbench + CFX v.11
I model the interaction beetwen an aortivc valve and blood (biomechanics). I defined the model of the structure in Simulation and in the next step I modeled the blood in CFX. First I obtain the solution from cfx and than obtain the total mesh displacement for the structure. Everything is fine. The problem appear in secend itearation. I obtain the solution for CFX but something is happening with the structure. The model of the structure converged but the displacment does'nt change, the time of the analysis starts from 0 and the number of the loadstep is 1. Here is the monitor.
Could anybody tell me what's wrong ??
SOLUTION HISTORY INFORMATION FOR JOB: ANSYS.mntr
ANSYS RELEASE 11.0 13:37:04 07/14/2009
LOAD SUB- NO. NO. TOTL INCREMENT TOTAL
STEP STEP ATTMP ITER ITER TIME/LFACT TIME/LFACT MONITOR MONITOR
CPU MxDs MxPl
1 1 1 2 35 0.10000E-04 0.10000E-04 141.61 0.28203E-03 0.78886E-30
1 2 1 1 36 0.10000E-04 0.20000E-04 218.69 0.28203E-03 0.78886E-30
1 3 1 1 37 0.83333E-05 0.28333E-04 298.25 0.28203E-03 0.78886E-30
1 4 1 1 38 0.83333E-05 0.36667E-04 374.12 0.28203E-03 0.78886E-30
1 5 1 1 39 0.83333E-05 0.45000E-04 454.72 0.28203E-03 0.78886E-30
the third and fourth iteration look similar. :(
one simple thing you need to check is if both the geometries (fsi surface especially) lie at exact place within both (fluid and structural ) domain. This you can check in cfx post
Let me know if still you stuck
Thank you for your answer. I defined my fsi interface in the Ansys Simulation doing the named selection of the inflow and outflow surfaces. In CFX I defined the fsi interface as a boundary condition (wall) and selected the surfaceses.
Now I try to analyze two first steps. I decrease load step time to 0,0001[s] to do first and secend iteration and the bugs looks similar I described. If I increase LS time to 0,01 I get the negative volume element on the begining of secend iteration (CFX calculation). Could you write the most important aspects to define in both structure and CFX simulation. I'm despered.
I obtained after the structure calculation, CFX starts and
FIELD SOLUTION CONVERGENCE
CONVERGENCE OF FIELD SOLVER: ANSYS. . . . . TRUE
CONVERGENCE OF FIELD SOLVER: CFX. . . . . FALSE
After this I get no chande in the defomation status of the structure. I checked the fsi interface and I'm fully aware that it is ok.
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