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Experiments are conducted to examine the characteristics of internal waves generated by a towing hemispheroid model alongside the side wall of stratified fluid flume with a linear density distribution. By the measured results with multi-channel conductivity arrays, the wave patterns, the vertical displacement and the correlation velocity for such internal waves are analyzed. Two distinct types of internal waves are obtained in experiments. One is the body-generated internal wave by the steady source with respect to the hemispheroid model, and the other is the wake-generated internal wave by the unsteady source. The transition between these two types of internal waves occurs at a critical Froude number of FrS=1.6. The corresponding comparison with towing spheroid model experiments is carried out. It follows that the number FrS is about 2/3 that of the spheroid and that the transition is more rapid and its borderline is more clear-cut than those of the spheroid modes. The body-generated internal waves of both experimental models have identical characteristics, but the draining-water volume is about 2/3 that of the spheroid model. Their wake-generated internal waves possess similar variation tendencyies, but their wave speed is about 2/3 that of the spheroid model . It also proves that this mirror-image experimental method in the flume can increase the effective range of spatio-temporal evolvement of body-generated internal waves.
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Keywords:
- stratified fluid /
- hemispheroid model /
- internal wave /
- wake
[1] Lamb H 1932 Hydrodynamics (Cambridge: Cambridge University Press)
[2] Gilreath H E, Brandt A 1985 J. AIAA 23 693
[3] Bonnier M, Eiff O 2002 Phys. of Fluid 14 791
[4] Wei G, Dai S Q 2006 Advances in Mechanics 36 111(in Chinese) [魏 岗、 戴世强 2006 力学进展 36 111]
[5] Yeung R W, Nguyen T C 1999 J. Eng. Math. 35 85
[6] Wei G, Lu D Q, Dai S Q 2005 Acta Mechanica Sinica 21 24
[7] Fincharm A M, Maxworth T, Speeding G R 1996 Dyn. Atmos. Ocean 23 155
[8] Chomaz J M, Hopfinger E J 1993 J. Fluid Mech. 254 1
[9] Wei G, Zhao X Q, Su X B, You Y X 2009 Science in Chinese G 39 1169 (in Chinese) [魏 岗、 赵先奇、 苏晓冰、尤云祥 2009 中国科学 G辑 39 1169]
[10] Robey H F 1997 Phys. of Fluid 9 3353
[11] Lu H M, Xu Z T, Fang X H 1995 Chinese J. Hyd. Series A 10 328 (in Chinese) [吕宏民、 徐肇廷、 方欣华 1995 水动力学研究与进展A辑 10 328]
[12] You Y X, Zhao X Q, Chen K 2009 Acta Phys. Sin. 58 74 (in Chinese) [尤云祥、 赵先奇、 陈 科等 2009 58 74]
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[1] Lamb H 1932 Hydrodynamics (Cambridge: Cambridge University Press)
[2] Gilreath H E, Brandt A 1985 J. AIAA 23 693
[3] Bonnier M, Eiff O 2002 Phys. of Fluid 14 791
[4] Wei G, Dai S Q 2006 Advances in Mechanics 36 111(in Chinese) [魏 岗、 戴世强 2006 力学进展 36 111]
[5] Yeung R W, Nguyen T C 1999 J. Eng. Math. 35 85
[6] Wei G, Lu D Q, Dai S Q 2005 Acta Mechanica Sinica 21 24
[7] Fincharm A M, Maxworth T, Speeding G R 1996 Dyn. Atmos. Ocean 23 155
[8] Chomaz J M, Hopfinger E J 1993 J. Fluid Mech. 254 1
[9] Wei G, Zhao X Q, Su X B, You Y X 2009 Science in Chinese G 39 1169 (in Chinese) [魏 岗、 赵先奇、 苏晓冰、尤云祥 2009 中国科学 G辑 39 1169]
[10] Robey H F 1997 Phys. of Fluid 9 3353
[11] Lu H M, Xu Z T, Fang X H 1995 Chinese J. Hyd. Series A 10 328 (in Chinese) [吕宏民、 徐肇廷、 方欣华 1995 水动力学研究与进展A辑 10 328]
[12] You Y X, Zhao X Q, Chen K 2009 Acta Phys. Sin. 58 74 (in Chinese) [尤云祥、 赵先奇、 陈 科等 2009 58 74]
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