Transient axisymmetric heat transfer
Transient axisymmetric heat transfer
(OP)
Dear Abaqus experts/users,
I have a question regarding my Abaqus axisymmetric heat transfer model (please see attached). Initially, I wanted to run the heat transfer case first then get the temperature to find thermal stresses. The model is a very simple one, a cylinder (rectangle in 2D), with inner surface heat flux load and outer convection boundary condition. What I'm trying to do is to vary the surface heat flux with time. The code works perfectly when there's no time dependence but when I change the amplitude from instantaneous to tabular or decay and insert the time variables. I get the following error message: "Time increment required is less than the minimum specified".
Well..., I tried to lower the minimum increment as the message suggests but still no hope. It works when the time increment is ridiculously small (e-9!!!!). This is obviously not a solution as the run will take literally for ever to finish.
I would highly appreciate your help, I need this to be sorted out ASAP and would be grateful for your quick responses.
Kate
http ://files.e ngineering .com/getfi le.aspx?fo lder=5df1e 9d6-7211-4 b33-9a7c-2 64ad6406f0 0&file =Cladding- thermal-an alysis.inp
I have a question regarding my Abaqus axisymmetric heat transfer model (please see attached). Initially, I wanted to run the heat transfer case first then get the temperature to find thermal stresses. The model is a very simple one, a cylinder (rectangle in 2D), with inner surface heat flux load and outer convection boundary condition. What I'm trying to do is to vary the surface heat flux with time. The code works perfectly when there's no time dependence but when I change the amplitude from instantaneous to tabular or decay and insert the time variables. I get the following error message: "Time increment required is less than the minimum specified".
Well..., I tried to lower the minimum increment as the message suggests but still no hope. It works when the time increment is ridiculously small (e-9!!!!). This is obviously not a solution as the run will take literally for ever to finish.
I would highly appreciate your help, I need this to be sorted out ASAP and would be grateful for your quick responses.
Kate
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RE: Transient axisymmetric heat transfer
In the STEP module ABAQUS uses a defoult value for the max number of increments; so you have to change it because the analysis will be aborted due to a not enough increments.
Try this:
In the STEP module EDIT your step and modify this (in the second page):
Maximum number of increment: 1000
RE: Transient axisymmetric heat transfer
Kate
RE: Transient axisymmetric heat transfer
HTH,
Dan
RE: Transient axisymmetric heat transfer