In general, the thermal jet flow generated by cooling water discharge from a submarine is modeled as the horizontal thermal buoyancy jet. Most of the previous experimental research does not take the influence of density gradient into account, and only a few computational investigations considered the effect of jet temperature. In this paper, a temperature-driven density stratification method is proposed to achieve the continuously density stratified fluid and then implemented in the commercial software STAR-CCM+ 2302. The linear temperature distribution in the background is specified, and the relationship between density and temperature is then provided explicitly. The large eddy simulation is used to model horizontal thermal buoyancy jet turbulence. Results show that the trajectory centerline of a jet experiences a “horizontal zone,” a “transition zone,” and a “stable zone.” The centerline trajectory of the jet may vary based on the definition of specific physical parameters, and the temperature and flow rate of the jet can affect the temperature and vorticity variation curve of the jet. The closer the jet is to the nozzle, the higher the temperature and vorticity values of the jet, and the faster the decay. A larger density gradient and Reynolds number inhibit the buoyancy of the jet.

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