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September 23, 2011, 10:27 |
FSI interfaces not connected
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Member
Join Date: Apr 2011
Posts: 32
Rep Power: 14 |
As you can see in the attached picture, there is a gap between the two domains that is not supposed to exist. (the displacements are amplified) The interface is somehow opened although data is exchanged and sometimes the solution converges (only in mechanical FSI with adiabatic walls, meaning without heat exchange).
In a fully coupled FSI approach the solution diverges, but I cannot identify the reason yet. It is possible that the gap has nothing to do with that. Nevertheless, I would like to solve that problem first. The ANSYS.stdout tells me that the mapping was perfectly successful and the warnings refer only to the fact, that there are sometimes not enough stagger iterations. Since there are no further errors related to the gap at the interfaces, I only post the ending of my ANSYS.mf file. I hope that you can help me. Thank you in advance!! edit: I recognized that the gap gets smaller, if the the solution approaches convergence. There might be no gap at the end. But in my opinion there should be no gap at all any time! last rows of ANSYS.mf: _________________________ /prep7 ! Tet10/Hex20 Structural et_tet = 187 et_hex = 186 ! Tet10/Hex20 Multi-Field et_tet_mf = 227 et_hex_mf = 226 alls ! Modify Tet10 *get,etid,etyp,0,num,max etid = etid + 1 et,etid,et_tet_mf,11 type,etid esel,s,enam,,et_tet emodif,all,type,etid alls ! Modify Hex20 *get,etid,etyp,0,num,max etid = etid + 1 et,etid,et_hex_mf,11 type,etid esel,s,enam,,et_hex emodif,all,type,etid alls /solu ! ****** End Command Snippet ****** ! ****** Begin Command Snippet ****** ! Commands inserted into this file will be executed just prior to the Ansys SOLVE command. ! These commands may supersede command settings set by Workbench. ! Active UNIT system in Workbench when this object was created: Metric (m, kg, N, s, mV, mA) cmsel,s,tempup d,all,temp,176.85 alls cmsel,s,tempdown d,all,temp,26.85 alls ! ****** End Command Snippet ****** ! *********** WB SOLVE COMMAND *********** ! check interactive state *get,ANSINTER_,active,,int *if,ANSINTER_,ne,0,then *endif MFAN,ON MFTI,0.2 MFDT,0.001,0.001,0.001,OFF MFLC,SURF,ANSYS,2,DISP,CFX,'WALL_F_R','Total Mesh Displacement',NONC MFLC,SURF,CFX,'WALL_F_R','Total Force',ANSYS,2,FORC,CPP MFLC,SURF,ANSYS,1,DISP,CFX,'WALL_F_S','Total Mesh Displacement',NONC MFLC,SURF,CFX,'WALL_F_S','Total Force',ANSYS,1,FORC,CPP MFIT,8,2,8 MFCO,ALL,1e-2 MFRE,ALL,0.3,RELX MFPS,group1,ANSYS MFPS,group2,CFX MFSO,group2,group1 CMWRITE,ANSYS,cm KBC,1 /GST,ON,ON SOLVE SAVE CMWRITE,ANSYS,cm FINISH /EXIT _________________________ Last edited by MainzerKaiser; September 23, 2011 at 12:26. |
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