I simulate 3d seawater in the case of dispersion thermal analysis of the power plant cooling water using ansys fluent, the geometry and namely boundary conditions that I modelled is shown in the figure bellow. In modelling physical models used k-epsilon and active energy. the material used is only one phase, namely water. Temperatur normal seawater set 30℃ and temperatur discharge outlet 37℃.The boundary conditions are discharged outlets, ambient inlet, outlet, ocean, seabed and seashore. The discharge outlet is the discharge area of the cooling water power plant modelled as an inlet velocity with a velocity of 1.71 m / s and a temperature value of 37℃, the ambient inlet boundary condition is modelled as an inlet velocity at 0.4 m / s and a temperature value of 30℃.Outlet modelled as outflow.Seabed and seashore as a wall.

For ocean boundary conditions I model as symmetry. what I want to ask, in my case is it okay if I model ocean as symmetry? Can anyone explain that? Or do I need to use other boundary conditions?