Runge-Kutta 4rd Order method help for 6DoF in CFD
 

Hi,

I've written a code for using with my CFD to move a rigid body under the CFD derived loads, CFD also takes care of the mesh changes. The DoF code uses the Euler method, as it was simple to do initially. Now I would like to put in the Runge-Kutta 4th order method. I've got the equations from a textbook but I cannot find any info on how to use it for actual physical expressions.

Can anyone show how to use the RK4 for working out motion from force values?

Thanks.