Mass assignment in 2D simulations
I would like to ask about the 3D model I created when I was modeling, but I wanted to do a 2D simulation, and suddenly I had a question. I have set as following:
Question:
If I do this, is this mass assigned to a 2D disk or a 3D cylinder?
Because I found that when I was modeling a cylinder, when the y-direction length was different, the reaction of the cylinder was different (the mass value did not change, only the y value during modeling was changed).
The y range of the box is -0.05 to 0.05
Option One:
The cylinder is basically stationary
Option two:
The cylinder begins to move rapidly.
I don't know if it's a side wall effect or a quality issue. is this mass assigned to a 2D disk or a 3D cylinder?
Debug Trace
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Comments
@Alex @Asalih3d
Excuse me, can you give me some help or explanation for this problem?
@Alex @Asalih3d
Can you give me some help or explanation for this problem?
Thanks very much!
Best regards!
Mass is assigned to the object to compute weight force.
So you have to assign the actual value.
Note that 2D mass is not equal to 3D mass....
Mass(2D)=Mass(3D) / widthY
@Alex OK, I think I have understand. Do as I did in the picture above, this mass is assigned to a 2D disk. But what I want to ask here is another question, Why do models built from 3D affect the simulation when I'm doing a 2D simulation?
In the 3D modeling, the length of the aluminum rod is different, and the results of the simulation are different: in the first case, the y-coordinate of the aluminum rod is from -0.049m to 0.049m, and the simulation result is that the aluminum rod will not collapse. In the second case, the y-coordinate of the aluminum rod is from -0.01m to 0.01m, and the simulation result is that the aluminum rod will collapse