An Experimental Comparison of Internal Waves Generated by a Moving Hemispheroid or Spheroid Model Respectively in a Stratified Fluid Tank

Experiments were conducted to examine the characteristics of internal waves generated by a towing hemispheroid model alongside the side wall of stratified fluid tank with a linear density distribution. By means of the measuring results with multi-channel conductivity-probe arrays, wave patterns, vertical displacement and correlation velocity for such internal waves were analyzed. The corresponding comparison with towing spheroid model experiments was carried out. It follows that the critical Froude number Fr-s of the hemispheroid is about 2/3 of the spheroid, and its draining-water volume and propagating speed are about 2/3 of the spheroid respectively. It is also proved that the mirror-image experimental method in the tank can increase the effective range of spatio-temporal evolvement for the body-generated internal wave.