The natural convection problem was more difficult to solve. As with the forced convection model, thenatural convection problem was solved using conjunctive heat transfer formulation. The FLUID141elements were also used with a material property of steel specified. Temperature dependent waterproperties were specified through a material property table. Three natural convection models were solved inthis effort. The first two problems solved were theoretical examples for comparison with the reference 4calculations. These were horizontal and vertical flat plate models. The last model is a more complexgeometric model of a ship hull section.The model shown in Figure 7 is the natural convection model of a 100-foot horizontal flat plate with thesame hull thermal conductivity as the force convection model. The visual mesh is water at a constanttemperature of 547.75 R. This model was meshed with quadrilateral elements. The remaining boundaryconditions are V y = 0.0 and a constant plate temperature of 555.98 R. The 20-foot vertical plate model issimilar to Figure 7, except rotated 90 degrees and reduced in size by a factor of 5.