Discussion Forum

Please like me guidance on how I should introduce ODE with COMSOL 3.5, trajectory simulations are the solution of ODE equations (below) to applied acoustic radiation force which are based on the eigenfrequencies found according to my query yesterday, then the new value obtained with COMSOL 3.5' It ODE equations (balance of movement) and R write with MATLAB 7.4 and finally get the trajectory of particles but with MATLAB.

My question is how should I introduce my ODE equations with COMSOL 3.5 and that as I have read in the guide multiphysic COMSOL ODE can be solved.

The equations governing the motion inside a tube are:

a, b, c, d, e, f are constant

x and y are variables 2D

x " second derivative of x with respect to time

x ' first derivative of x with respect to time



x''= a * (y ^ 2) - x '+ c (1)

ay''= d * sin (d * y) - e * y '+ f (2)


boundary conditions t = 0 x = xo and y = yo
final time t = 5

solving equations (1) and (2) I can plot the movement of particles

Please please tell me how I can add these ODE with COMSOL 3.5 and confused I see the brief explanation of the guide multiphysic

Attentively

Manuel Rosas

manueldidy@yahoo.es