[davids88704]

hi everyone
I use spring with damping coefficient in 8 cases, and damping coefficient value are 1000,2000,3000,6000,8406.08,12000,24000,35327.2 , and simulate them.
When damping coefficient value are 1000~6000, they don't have warning, but damping coefficient value are 8406.08~35327.2 have warning.

the warning message is

" recommend reducing cfpk by factor of 10
convective flux exceeded stability limit
at t= 1.4465E+01 cycle= 5736 iter= 11 delt= 1.1063E-03 mesh block 2
restarting cycle with smaller time step
maximum failure ratio = 1.28097E+00 is in y-coordinate direction
at cell ( 82, 2, 34) mesh block 2 "

and

" convective flux exceeded stability limit
at t= 1.1680E+01 cycle= 4420 iter= 12 delt= 2.8356E-03 mesh block 3
restarting cycle with smaller time step
maximum failure ratio = 1.03430E+00 is in y-coordinate direction
at cell ( 55, 5, 63) mesh block 3 "

Please help me.
thanks a lot.