CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Force on cylinders through momentum balance

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   April 14, 2000, 08:27
Default Force on cylinders through momentum balance
Mauro Oliveira
Posts: n/a

I'm developing a CFD 2D finite element method code in my PhD thesis. I'm interested in vortex shedding vibrations of cylinders. In this way I want to calculate forces acting over the cylinder. Besides the conventional integration of tensions due to pressure and velocities over the cylinder wall, I'm also using the balance of momentum approach. This approach is convenient because the matrices are already assembled and it avoids errors in the integration of the cylinder wall. But I'm having some problems. I assembled the matrix equations in order to attain the forces in x and y directions as a nodal quantity. The LHS is composed of a vector of nodal force components times a mass matrix integrated over the Dirichlet boundaries of the problem.(See page 860 of the book of P. Gresho) My questions are: 1) After obtaining the nodal force components how can I get the total force acting over the body? 2) If I have two bodies in the problem, can I use this method to obtain forces in each body ? Can I generate the mass matrix for each body or I have to integrate this mass matrix over all Dirichlet boundaries that are present in the problem?

Thanks, Mauro
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Computing wall shear stress with a momentum flux balance Pomme-Poire OpenFOAM Post-Processing 0 October 5, 2010 17:39
how to add a force in the momentum equation guillaumem OpenFOAM 0 June 14, 2010 03:49
Derivation of Momentum Equation in Integral Form Demonwolf Main CFD Forum 2 October 29, 2009 20:53
Modelling a force as a momentum source term - HELP Rick FLUENT 0 March 9, 2006 11:28

All times are GMT -4. The time now is 06:28.