I am doing an explicit analysis in LS Dyna using EM solver. I am trying to develop a numerical model for electromagnetic forming application. Can someone explain about reducing time step size through input deck?
Hello,
I have not worked with EM solver. But, if the procedures are the same, you can go to *CONTROL_TIMESTEP and modify (reduce) the TSSFAC parameters to your preference. If this doesn't help, you may go to this link https://www.dynaexamples.com/em/em_forming to see the example keyword file. I hope this will help.
Regards
The discretization of time by a known method in fast-flowing energy processes is fraught with large errors for all computer program systems.
To eliminate errors, it is necessary to use the generalized finite difference method.
The essence of the generalized method of finite differences:
1. An arbitrary time step is specified.
2. The initial system of equations is written in the "left" derivative.
3. The initial system of equations is written down by the "right" derivative.
4. Both systems of equations are solved together. A general solution is obtained for the initial and final data of the parameter, which depends on the time step.
5. In the general solution, you aim the time step to zero or a given small value. Get the value of the parameter for the specified time step.
With the general method you can get acquainted (Ukrainian language):
http://www.slavdpu.dn.ua/fmk/publications/scientific%20articles/sci-art_27-all.pdf
Ye Pyae Sone Oo Thank you very much for your suggestion. I was trying it already but not getting very significant results.
This method is subject to the joint action of laws: the conservation, change, transfer and packaging of energy. He can not work. The method is universal.
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