Hi,

I try to simulate the wave of a blast.

So as to do that, I try to make moving a semicircle wall imputing the blast equation.

How can I imput this displacment when it is actually an enlargement of the radius of this semicircle?

I don't know how I can imput a rate of change of the radius.

If you have another idea, each point of this semicircle as to move with the same speed but in a different direction.( along its radius)

Thank you very much for your help.

Greg

Like I have no answetr I will try to simplify my question.

By using Define_Geom I want to set a movement depending of time.

My equation would look like something like this:

(position[0]-a)^2+(postion[1]-b)^2=((dtime-t0)*e(dtime-t0))^2 where a b are coordinate of the center of the circle and the second member of the equation the varying radius.

Any help or comment would help me.

Greg