A Study Of Sea Ice Suspended Two-Phase Flow Based On Large Eddy Simulation

Polar climate simulation is a key factor in understanding the behavior of the global climate system.Arctic sea ice as an important part of the Arctic climate system,is very important to ocean heat budget.Studies have shown that the Arctic climate system is undergoing a very significant change in the context of global warming.The ocean boundary layer of polar is mainly affected by sea ice motion,frazil ice,leads,roughness of the sea ice and so on.There are two processes controlling the properties of sea ice:Dynamical Process,which distorts the ice and makes the leads cracked and frozen;Thermodynamic Process,which controls the thaw of ice-capped peaks.This paper has developed a new sea ice model,besides,it made appropriate correction model of sea ice coupled with the LES model on the basis of predecessors' work.Numerical experiments were performed using a large-eddy simulation(LES)coupled with a ice model to investigate the frazil ice dynamics and sea ice motion on the winter of Arctic ocean boundary layer.The concentration of frazil ice is modeled by using a model of the OS(Omstedt and Svensson,1984).The ice crystal radius and growth rates are assumed to be constant,and change of the temperature and salinity with depth are taken into account.The results of this simulation are similar to those of previous literature.The frazil ice concentration distribution is affected by sea ice motion.When the sea ice is resting on the seawater,the frazil ice concentration is distributed in a cellular pattern,but this distribution will be damaged by the current caused by ice motion,frazil ice concentration is distributed in stripes,the direction of the stripe and currents is the same.The currents are deflected in a horizontal direction considering the earth's rotation in this model.Sea ice roughness plays an important role in the process of formation of the eddy current.Entrained flow caused by the movement of sea ice has a significant influence on the eddy,which affects the distribution of ice crystal in the vertical direction.And the ice crystal rise velocity and the source term coefficient of ice concentration affect the frazil ice dynamics.Temperature and salinity are always the two key variables of sea ice simulation.The influence of temperature and salinity on the interface between sea and ice is discussed in this paper.By changing the velocity of sea ice,the effects of salinity and temperature on the different velocity are explained.The presence of ice isolates the heat flux from the surface of the ocean.The motion of sea ice accelerates the transportation of vertical temperature and salinity,reducing the gradient of temperature and salinity.In addition,this paper also pays attention to transport phenomenon of temperature and salt fluxes in the vertical direction.The simulation results show that the rolling cycle of the temperature and salinity is accelerated due to the sea ice motion.