Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
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.
Taking Coriolis into account in Solids mechanics
Posted Mar 19, 2013, 10:16 a.m. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.2a 1 Reply
Please login with a confirmed email address before reporting spam
Hey,
I'm trying to implement a coriolis force thanks to a body load. For a rotation around the axe Z, I'm using the following expressions :
2*omega*solid.rho*vt
-2*omega*solid.rho*ut
0
My case is on a block. One side is fixed and I'm applying a force on the opposite side on the (Oy) axis.
Eventually, I don't have any response on the (Ox) axis. I got this method from a model (that was a MEMS as far as I can remember) and that seemed to work. Do you know why it doesn't ? Maybe are you taking into account this force with another method ?
Best regards,
JC.
I'm trying to implement a coriolis force thanks to a body load. For a rotation around the axe Z, I'm using the following expressions :
2*omega*solid.rho*vt
-2*omega*solid.rho*ut
0
My case is on a block. One side is fixed and I'm applying a force on the opposite side on the (Oy) axis.
Eventually, I don't have any response on the (Ox) axis. I got this method from a model (that was a MEMS as far as I can remember) and that seemed to work. Do you know why it doesn't ? Maybe are you taking into account this force with another method ?
Best regards,
JC.
Attachments:
1 Reply Last Post Mar 20, 2013, 5:30 a.m. EDT
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
you have an object vibrating and rotating, if I catch you right, now COMSOL uses omega for the frequency domain variable, so a) you should rather use another name, then b) "ut, vt" velocities from my understanding are better expressed in the frequency domain as omega*(u,v) where solid.omega is the 2*pi*solid.freq value of COMSOL (check the equations view and the equation TAB)
then you need to correctly set up the rotation and distance to the axis w.r.t. your object, you could use a cylindrical coordinate system under Definitions to help you out
--
Good luck
Ivar
you have an object vibrating and rotating, if I catch you right, now COMSOL uses omega for the frequency domain variable, so a) you should rather use another name, then b) "ut, vt" velocities from my understanding are better expressed in the frequency domain as omega*(u,v) where solid.omega is the 2*pi*solid.freq value of COMSOL (check the equations view and the equation TAB)
then you need to correctly set up the rotation and distance to the axis w.r.t. your object, you could use a cylindrical coordinate system under Definitions to help you out
--
Good luck
Ivar