Hi Everyone,
I have reviewed previous posts in Comsol forum about I.C . One of the suggested ways of applying the I.C was to do a stationary analysts before the time-dependent one. (This can be true for Cos-Wave as applied load or displacement has the value at time equal to zero and the velocity is zero at that time)
I am doing an analysis with Sin-Wave. Definitely applying stationary study before time-step will not provide the proper I.C here (Knowing that the Sin-Wave produces velocity at initial time).
(We can calculate the derivative of sin-wave as the velocity, however, it is not true to apply it as the velocity in I.C since considering the distance and the velocity of passing wave through the constituent materials it changes through the geometry and it is not constant.
(Having more complex geometry or more complex loads it gets really hard to get it).
(Just as a comment: Ivar had told that "applying Sin-Wave to a geometry as a BC acts as an Impulse through the Structure and causes many modes to get excited" so he had suggested to "apply the load in a Ramp". I really do not know how.
I am wondering if there is any good way for finding the Initial condition correctly and applying it to model.
I appreciate any comments,
Regards,
Masoud