Q. I am using the PLANE67 element in ANSYS and have achieved a solution in steady state. However, when I try to get the same result with the transient algorithm, the case immediately diverges. What can I do about it?
A. The fault lies in the value of THETA on the TINTP command. The value of 0.5, corresponding to the Crank-Nicholson approach to transients, is not stable for this problem. Set the value to 1.0, corresponding to a backward difference approach, with the command TINTP,,,,1.0.
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Q. I am using the PLANE67 element in ANSYS and have achieved a solution in steady state. However, when I try to get the same result with the transient algorithm, the case immediately diverges. What can I do about it? A. The fault lies in the value of THETA on the TINTP command. The value of 0.5, corresponding to the Crank-Nicholson approach to transients, is not stable for this problem. Set the value to 1.0, corresponding to a backward difference approach, with the command TINTP,,,,1.0. |
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