Force can not converge

colopolo · September 22, 2011, 22:05

Hi all,

I am simulationg vibration of plate using FSI.

When my case is running, it looks ok but I goe an error about force converge after some time step.

How to control force converge in FSI simulation?

Thanks in advance

The output is like this
MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS HAS BEEN MODIFIED
TO BE, NEQIT = 26, BY SOLUTION CONTROL LOGIC.
FORCE CONVERGENCE VALUE = 6252. CRITERION= 0.1013E-01
MOMENT CONVERGENCE VALUE = 902.5 CRITERION= 0.7761E-03
EQUIL ITER 1 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.5511E-02
LINE SEARCH PARAMETER = 0.9994 SCALED MAX DOF INC = 0.5508E-02
FORCE CONVERGENCE VALUE = 178.7 CRITERION= 0.5432E-01
MOMENT CONVERGENCE VALUE = 1.747 CRITERION= 0.3133E-02
EQUIL ITER 2 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1081E-01
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.1081E-01
FORCE CONVERGENCE VALUE = 459.3 CRITERION= 0.7236
MOMENT CONVERGENCE VALUE = 18.97 CRITERION= 0.1127
EQUIL ITER 3 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.3077
LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = -0.1539E-01
FORCE CONVERGENCE VALUE = 927.6 CRITERION= 0.1883
MOMENT CONVERGENCE VALUE = 21.47 CRITERION= 0.3344E-01
EQUIL ITER 4 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.9712E-01
LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = 0.4856E-02
FORCE CONVERGENCE VALUE = 931.2 CRITERION= 1.310
MOMENT CONVERGENCE VALUE = 23.78 CRITERION= 0.7281E-01
EQUIL ITER 5 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1393E-01
LINE SEARCH PARAMETER = 0.1108 SCALED MAX DOF INC = 0.1543E-02
FORCE CONVERGENCE VALUE = 831.4 CRITERION= 1.006
MOMENT CONVERGENCE VALUE = 20.60 CRITERION= 0.3555E-01
EQUIL ITER 6 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1311E-01
LINE SEARCH PARAMETER = 0.7095E-01 SCALED MAX DOF INC = -0.9299E-03
FORCE CONVERGENCE VALUE = 774.9 CRITERION= 0.9580
MOMENT CONVERGENCE VALUE = 19.67 CRITERION= 0.3672E-01
EQUIL ITER 7 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.8859E-02
LINE SEARCH PARAMETER = 0.6283E-01 SCALED MAX DOF INC = 0.5566E-03
FORCE CONVERGENCE VALUE = 727.2 CRITERION= 0.9256
MOMENT CONVERGENCE VALUE = 18.24 CRITERION= 0.2789E-01
EQUIL ITER 8 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.6396E-02
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.6396E-02
FORCE CONVERGENCE VALUE = 161.4 CRITERION= 0.1909
MOMENT CONVERGENCE VALUE = 12.85 CRITERION= 0.4200E-01
EQUIL ITER 9 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1331
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.1331
FORCE CONVERGENCE VALUE = 0.6283E+05 CRITERION= 83.09
MOMENT CONVERGENCE VALUE = 1760. CRITERION= 7.059
EQUIL ITER 10 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1573
LINE SEARCH PARAMETER = 0.5441 SCALED MAX DOF INC = 0.8559E-01
FORCE CONVERGENCE VALUE = 0.3131E+05 CRITERION= 87.41
MOMENT CONVERGENCE VALUE = 846.3 CRITERION= 3.895
EQUIL ITER 11 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.7290E-01
LINE SEARCH PARAMETER = 0.9889 SCALED MAX DOF INC = 0.7209E-01
FORCE CONVERGENCE VALUE = 5883. CRITERION= 3.142
MOMENT CONVERGENCE VALUE = 180.2 CRITERION= 0.1070
EQUIL ITER 12 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1671E-01
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = 0.1671E-01
FORCE CONVERGENCE VALUE = 336.2 CRITERION= 0.3233
MOMENT CONVERGENCE VALUE = 11.14 CRITERION= 0.2086E-01
EQUIL ITER 13 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3954
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = 0.3954
FORCE CONVERGENCE VALUE = 0.3660E+06 CRITERION= 310.1
MOMENT CONVERGENCE VALUE = 0.1128E+05 CRITERION= 20.95
EQUIL ITER 14 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1732
LINE SEARCH PARAMETER = 0.8968 SCALED MAX DOF INC = 0.1553
1 FORCE-DISTRIBUTED CONSTRAINTS DO NOT SATISFY COMPATIBILITY CONDITION
FORCE CONVERGENCE VALUE = 0.4500E+05 CRITERION= 56.10
MOMENT CONVERGENCE VALUE = 2037. CRITERION= 2.005
EQUIL ITER 15 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1671
LINE SEARCH PARAMETER = 0.5095 SCALED MAX DOF INC = -0.8515E-01
FORCE CONVERGENCE VALUE = 0.2581E+05 CRITERION= 115.5
MOMENT CONVERGENCE VALUE = 980.1 CRITERION= 3.614
EQUIL ITER 16 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1249
LINE SEARCH PARAMETER = 0.3520 SCALED MAX DOF INC = 0.4398E-01
FORCE CONVERGENCE VALUE = 0.1696E+05 CRITERION= 68.74
MOMENT CONVERGENCE VALUE = 684.1 CRITERION= 2.620
EQUIL ITER 17 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.5225
LINE SEARCH PARAMETER = 0.9162E-01 SCALED MAX DOF INC = -0.4787E-01
FORCE CONVERGENCE VALUE = 0.1522E+05 CRITERION= 58.50
MOMENT CONVERGENCE VALUE = 624.2 CRITERION= 2.644
EQUIL ITER 18 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.5712E-01
LINE SEARCH PARAMETER = 0.7985 SCALED MAX DOF INC = -0.4561E-01
FORCE CONVERGENCE VALUE = 7083. CRITERION= 13.83
MOMENT CONVERGENCE VALUE = 319.0 CRITERION= 2.010
EQUIL ITER 19 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.3585E-01
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.3585E-01
FORCE CONVERGENCE VALUE = 6604. CRITERION= 8.681
MOMENT CONVERGENCE VALUE = 150.9 CRITERION= 1.513
EQUIL ITER 20 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.2946
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.2946
FORCE CONVERGENCE VALUE = 0.2065E+06 CRITERION= 177.5
MOMENT CONVERGENCE VALUE = 6606. CRITERION= 11.36
EQUIL ITER 21 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1289
LINE SEARCH PARAMETER = 0.7385 SCALED MAX DOF INC = -0.9519E-01
FORCE CONVERGENCE VALUE = 0.5226E+05 CRITERION= 80.58
MOMENT CONVERGENCE VALUE = 1557. CRITERION= 3.357
EQUIL ITER 22 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3865
LINE SEARCH PARAMETER = 0.1790 SCALED MAX DOF INC = 0.6918E-01
FORCE CONVERGENCE VALUE = 0.4413E+05 CRITERION= 149.3
MOMENT CONVERGENCE VALUE = 1294. CRITERION= 2.292
EQUIL ITER 23 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -1.864
LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = -0.9319E-01
FORCE CONVERGENCE VALUE = 0.3884E+05 CRITERION= 144.5
MOMENT CONVERGENCE VALUE = 1008. CRITERION= 1.913
EQUIL ITER 24 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.2576
LINE SEARCH PARAMETER = 0.6518 SCALED MAX DOF INC = 0.1679
FORCE CONVERGENCE VALUE = 0.3911E+05 CRITERION= 80.87
MOMENT CONVERGENCE VALUE = 1838. CRITERION= 4.715
EQUIL ITER 25 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3611
LINE SEARCH PARAMETER = 0.1451 SCALED MAX DOF INC = 0.5240E-01
FORCE CONVERGENCE VALUE = 0.3711E+05 CRITERION= 117.5
MOMENT CONVERGENCE VALUE = 1670. CRITERION= 3.896
EQUIL ITER 26 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1458
LINE SEARCH PARAMETER = 0.6567 SCALED MAX DOF INC = -0.9577E-01
FORCE CONVERGENCE VALUE = 0.1696E+05 CRITERION= 43.84
MOMENT CONVERGENCE VALUE = 740.1 CRITERION= 2.085

September 22, 2011, 22:05	Force can not converge	#1
colopolo Member ^^ Join Date: Aug 2011 Posts: 70 Rep Power: 14	Hi all, I am simulationg vibration of plate using FSI. When my case is running, it looks ok but I goe an error about force converge after some time step. How to control force converge in FSI simulation? Thanks in advance The output is like this MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS HAS BEEN MODIFIED TO BE, NEQIT = 26, BY SOLUTION CONTROL LOGIC. FORCE CONVERGENCE VALUE = 6252. CRITERION= 0.1013E-01 MOMENT CONVERGENCE VALUE = 902.5 CRITERION= 0.7761E-03 EQUIL ITER 1 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.5511E-02 LINE SEARCH PARAMETER = 0.9994 SCALED MAX DOF INC = 0.5508E-02 FORCE CONVERGENCE VALUE = 178.7 CRITERION= 0.5432E-01 MOMENT CONVERGENCE VALUE = 1.747 CRITERION= 0.3133E-02 EQUIL ITER 2 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1081E-01 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.1081E-01 FORCE CONVERGENCE VALUE = 459.3 CRITERION= 0.7236 MOMENT CONVERGENCE VALUE = 18.97 CRITERION= 0.1127 EQUIL ITER 3 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.3077 LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = -0.1539E-01 FORCE CONVERGENCE VALUE = 927.6 CRITERION= 0.1883 MOMENT CONVERGENCE VALUE = 21.47 CRITERION= 0.3344E-01 EQUIL ITER 4 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.9712E-01 LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = 0.4856E-02 FORCE CONVERGENCE VALUE = 931.2 CRITERION= 1.310 MOMENT CONVERGENCE VALUE = 23.78 CRITERION= 0.7281E-01 EQUIL ITER 5 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1393E-01 LINE SEARCH PARAMETER = 0.1108 SCALED MAX DOF INC = 0.1543E-02 FORCE CONVERGENCE VALUE = 831.4 CRITERION= 1.006 MOMENT CONVERGENCE VALUE = 20.60 CRITERION= 0.3555E-01 EQUIL ITER 6 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1311E-01 LINE SEARCH PARAMETER = 0.7095E-01 SCALED MAX DOF INC = -0.9299E-03 FORCE CONVERGENCE VALUE = 774.9 CRITERION= 0.9580 MOMENT CONVERGENCE VALUE = 19.67 CRITERION= 0.3672E-01 EQUIL ITER 7 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.8859E-02 LINE SEARCH PARAMETER = 0.6283E-01 SCALED MAX DOF INC = 0.5566E-03 FORCE CONVERGENCE VALUE = 727.2 CRITERION= 0.9256 MOMENT CONVERGENCE VALUE = 18.24 CRITERION= 0.2789E-01 EQUIL ITER 8 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.6396E-02 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.6396E-02 FORCE CONVERGENCE VALUE = 161.4 CRITERION= 0.1909 MOMENT CONVERGENCE VALUE = 12.85 CRITERION= 0.4200E-01 EQUIL ITER 9 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1331 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.1331 FORCE CONVERGENCE VALUE = 0.6283E+05 CRITERION= 83.09 MOMENT CONVERGENCE VALUE = 1760. CRITERION= 7.059 EQUIL ITER 10 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1573 LINE SEARCH PARAMETER = 0.5441 SCALED MAX DOF INC = 0.8559E-01 FORCE CONVERGENCE VALUE = 0.3131E+05 CRITERION= 87.41 MOMENT CONVERGENCE VALUE = 846.3 CRITERION= 3.895 EQUIL ITER 11 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.7290E-01 LINE SEARCH PARAMETER = 0.9889 SCALED MAX DOF INC = 0.7209E-01 FORCE CONVERGENCE VALUE = 5883. CRITERION= 3.142 MOMENT CONVERGENCE VALUE = 180.2 CRITERION= 0.1070 EQUIL ITER 12 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1671E-01 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = 0.1671E-01 FORCE CONVERGENCE VALUE = 336.2 CRITERION= 0.3233 MOMENT CONVERGENCE VALUE = 11.14 CRITERION= 0.2086E-01 EQUIL ITER 13 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3954 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = 0.3954 FORCE CONVERGENCE VALUE = 0.3660E+06 CRITERION= 310.1 MOMENT CONVERGENCE VALUE = 0.1128E+05 CRITERION= 20.95 EQUIL ITER 14 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1732 LINE SEARCH PARAMETER = 0.8968 SCALED MAX DOF INC = 0.1553 1 FORCE-DISTRIBUTED CONSTRAINTS DO NOT SATISFY COMPATIBILITY CONDITION FORCE CONVERGENCE VALUE = 0.4500E+05 CRITERION= 56.10 MOMENT CONVERGENCE VALUE = 2037. CRITERION= 2.005 EQUIL ITER 15 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1671 LINE SEARCH PARAMETER = 0.5095 SCALED MAX DOF INC = -0.8515E-01 FORCE CONVERGENCE VALUE = 0.2581E+05 CRITERION= 115.5 MOMENT CONVERGENCE VALUE = 980.1 CRITERION= 3.614 EQUIL ITER 16 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.1249 LINE SEARCH PARAMETER = 0.3520 SCALED MAX DOF INC = 0.4398E-01 FORCE CONVERGENCE VALUE = 0.1696E+05 CRITERION= 68.74 MOMENT CONVERGENCE VALUE = 684.1 CRITERION= 2.620 EQUIL ITER 17 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.5225 LINE SEARCH PARAMETER = 0.9162E-01 SCALED MAX DOF INC = -0.4787E-01 FORCE CONVERGENCE VALUE = 0.1522E+05 CRITERION= 58.50 MOMENT CONVERGENCE VALUE = 624.2 CRITERION= 2.644 EQUIL ITER 18 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.5712E-01 LINE SEARCH PARAMETER = 0.7985 SCALED MAX DOF INC = -0.4561E-01 FORCE CONVERGENCE VALUE = 7083. CRITERION= 13.83 MOMENT CONVERGENCE VALUE = 319.0 CRITERION= 2.010 EQUIL ITER 19 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.3585E-01 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.3585E-01 FORCE CONVERGENCE VALUE = 6604. CRITERION= 8.681 MOMENT CONVERGENCE VALUE = 150.9 CRITERION= 1.513 EQUIL ITER 20 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.2946 LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -0.2946 FORCE CONVERGENCE VALUE = 0.2065E+06 CRITERION= 177.5 MOMENT CONVERGENCE VALUE = 6606. CRITERION= 11.36 EQUIL ITER 21 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1289 LINE SEARCH PARAMETER = 0.7385 SCALED MAX DOF INC = -0.9519E-01 FORCE CONVERGENCE VALUE = 0.5226E+05 CRITERION= 80.58 MOMENT CONVERGENCE VALUE = 1557. CRITERION= 3.357 EQUIL ITER 22 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3865 LINE SEARCH PARAMETER = 0.1790 SCALED MAX DOF INC = 0.6918E-01 FORCE CONVERGENCE VALUE = 0.4413E+05 CRITERION= 149.3 MOMENT CONVERGENCE VALUE = 1294. CRITERION= 2.292 EQUIL ITER 23 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -1.864 LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = -0.9319E-01 FORCE CONVERGENCE VALUE = 0.3884E+05 CRITERION= 144.5 MOMENT CONVERGENCE VALUE = 1008. CRITERION= 1.913 EQUIL ITER 24 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.2576 LINE SEARCH PARAMETER = 0.6518 SCALED MAX DOF INC = 0.1679 FORCE CONVERGENCE VALUE = 0.3911E+05 CRITERION= 80.87 MOMENT CONVERGENCE VALUE = 1838. CRITERION= 4.715 EQUIL ITER 25 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3611 LINE SEARCH PARAMETER = 0.1451 SCALED MAX DOF INC = 0.5240E-01 FORCE CONVERGENCE VALUE = 0.3711E+05 CRITERION= 117.5 MOMENT CONVERGENCE VALUE = 1670. CRITERION= 3.896 EQUIL ITER 26 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -0.1458 LINE SEARCH PARAMETER = 0.6567 SCALED MAX DOF INC = -0.9577E-01 FORCE CONVERGENCE VALUE = 0.1696E+05 CRITERION= 43.84 MOMENT CONVERGENCE VALUE = 740.1 CRITERION= 2.085

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Viscous force and coefficient viscous force	tobino	Main CFD Forum	0	February 20, 2011 21:06
User-defined force transfer across FSI interface	vivekcfd	CFX	7	March 10, 2010 20:43
Urgently Need the code of Lift force and VM force	Kai Yan	Main CFD Forum	0	July 16, 2008 07:07
DEFINE_CG_MOTION and pressure force	Teo Fumagalli	FLUENT	0	April 11, 2008 10:25
pressure force and viscous force	CFD	FLUENT	0	March 7, 2006 01:03