Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
non 0 initial velocity in solid mechanics takes no effect in stationary analysis?
Posted 26 mars 2024, 23:55 UTC−4 4 Replies
Please login with a confirmed email address before reporting spam
In stationary analysis, if one sets a non 0 initial velocity in solid mechanics, is that simply ignored? That is, stationary analysis doesn't at all allow straight line uniform motion with no acceleration? Or stationary analysis doesn't allow any steady motion at all?
Please login with a confirmed email address before reporting spam
Yes, initial velocities do not affect stationary results.
In a stationary analysis, it is necessary that there are enough constraints to suppress any rigid body motions.
-------------------Henrik Sönnerlind
COMSOL
Please login with a confirmed email address before reporting spam
Thank you. Why do we sometimes see that the solution is still obtained even when there's not enough boundary conditions to suppress rigid body motions?
Please login with a confirmed email address before reporting spam
That can sometimes happen if there are 'enough' numerical inaccuracies so that the stiffness matrix is not identified as singular. Also, sometimes an iterative equation solver can happen to find a solution.
When it happens, there is typically an arbitrary rigid body superimposed over the deformations.
-------------------Henrik Sönnerlind
COMSOL
Please login with a confirmed email address before reporting spam
Thank you