海山后尾迹涡形成因素的数值研究

Numerical study of the factors affecting the wake vortex formation behind the seamount

该文采用regional ocean modeling system(ROMS)海洋模式,对理想channel中的海山模型,研究均匀分层流作用下,不同的伯格数和来流条件对海山诱导的尾迹涡及垂向流动的影响。结果表明,伯格数越大,越有利于海山后尾迹涡的产生,涡的强度不断增大,且涡脱落频率加快;随流速的增加,海山后尾迹涡的强度增大,涡脱落频率加快,且海山周围的垂向流动增强;当来流速度较低(0.05 m/s)及较高(0.8 m/s)时,均不利于在海山后形成稳定的垂向流动。

The influences of Burger number and flow condition on the wake vortex and vertical flow around the seamount through the uniform inflow in an ideal channel were investigated using the Regional Ocean Modeling System（ROMS）. Results show that, the larger the Burger number, the easier formation of wake vortex, and the stronger the wake vortex, and the faster frequency of the vortex shedding. With the increase of the flow velocity, the strength of the wake vortex becomes large and the vortex shedding frequency speeds up and the vertical flow around the seamount is also strengthened. When the inflow is too small（0.05 m/s） or too large（0.8 m/s）, it is difficult to produce the steady vertical flow behind the seamount.