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Multiple steps in a simulation
Posted 14.04.2011, 18:30 GMT-4 Studies & Solvers, Structural Mechanics Version 4.1, Version 4.2 6 Replies
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Is it possible to run a simulation of multiple steps where you have different sets of boundary conditions for each of the steps?
Im hoping to run a 2D structural mechanics contact simulation composed of two steps. The first step involves a block deforming the surface of a larger surface beneath it some amount (deltaY), then I would like to transition to a step where I fix deltaY=0 and create a constant velocity in the x while maintaining the block in a position where the surface underneath it is deformed. The idea is to simulate a block pushing into a larger surface, and then drag it along the surface to study the stresses on the block.
Thanks in advance for your help!
Shihai
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what I do sometimes is to use "Param" as a boolean switch. The only drawback is when the solver has some difficulties, then it tries an intermediate value for the "Param" which does not make any sens
on the BC you then might write something like my_condition = (100 + 200*(Param==1) )*(Param<2)
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Good luck
Ivar
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I am trying similar problem. What I am trying to do a structural mechanics simulation on a capacitive sensor to simulate a vibration and then find the capacitance change with respect to vibration. It means I am doing a vibration simulation and then a electrostatics simulation to find the capacitance change. Is it possible in COMSOL?
Thanks
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if you use an eigenmode solver your amplitudes are not "real" so the capacitance value will not be real either.
I would rather deform the structure with a parametric Force or pressure value and with a stationary solver.
By the way I'm replying from a TGV train midway between France and Germany at 317km/h, internet works fine even here, ... today :)
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Good luck
Ivar
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Thanks for the answer. I am using a time dependent simulation. I have created the vibration with a "prescribed displacement"(at structural mechanics module). But after that I need to find the capacitance simulation. I need to find the capacitance each time.I am attaching a file that will explain what I have done yet.
Attachments:
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Well either you calculate the capacity with the ACDC module physics by using the calculated field, or you calculate / integrate the average distance versus area to get the capacity of a plane paralle plate
Both, in your case, should give similar results (5-10%), at least from my understanding of your model (but I might be wrong as "just" an image is not really enough to understand all the subtilities ;)
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Good luck
Ivar
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Thanks for the answer
Mustafa