The Taylor impact problem from the ANSYS LS-DYNA 7.1 seminar works through release 10.0, but in 11.0, it immediately crashes. Is this a known error?
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Defect 59598 was filed and LSTC was notified of the change in behavior. However, LSTC just noted to change the hourglass control from the stiffness form to the viscous form, and the problem would run. They also suggested advecting every 10 cycles instead of every 20 for higher accuracy, but the results for that change do not show any appreciable difference. The attached input shows the updated approach and the specific changes are also shown below: !!! edmp,hgls,2,5 ! stiffness hourglass control edmp,hgls,2,1 ! standard LS-DYNA viscous hourglass control . . . !!! edmp,hgls,3,5 ! stiffness hourglass control edmp,hgls,3,1 ! standard LS-DYNA viscous hourglass control . . . edale,add,, ,1, ,1 ! volume-weighted and equipotential smoothing !!! edgcale,20,1 ! advect every 20 cycles using Van Leer method edgcale,10,1 ! advect every 10 cycles using Van Leer method |
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