Hi,
Is there a way to restrain the "obstacle" part from moving with the barge? For instance, in the quay.cif example, the quayside is moving together with the barge body, whereas I guess it shouldn´t, being a quayside. In the MOSES reference manual it states that the "obstacle" part doesn´t move unless an &instate command is used. How is this handled in the time domain?
Thank you and best regards,
Berislav
On animating the results you do see that the "obstacle" part is moving with the barge indeed. Although the "obstacle" appears to be moving with the barge, their relative position does not change. The term relative is key here.
The hydrodynamic database is calculated between the quayside and the barge with their relative position unchanged†. This situation creates a condition where the two parts, barge and quayside, move as one entity with their relative position unchanged. The same is observed for the relative velocity Vrel, between the two parts where Vrel is almost zero. Even if two points are in motion, zero relative velocity between the two means that point A is at rest with respect to point B, and point B is at rest with respect to point A.
† The Y position is zero, or almost zero for most of the analysis, between the two parts; this can be found by using dummy points. This condition of almost zero relative position is believed to be satisfactory for hydrodynamic interaction purposes.
Regards,Spiro J. PahosBentley Systems, Inc.