Numerical modelling of circulation in Lake Sperillen, Norway

A three-dimensional numerical model was used to model water circulation and spatial variation of temperature in Lake Sperillen in Norway. A winter sit uation was simulated, with thermal stratification and ice cover. The numeri cal model solved the Navier-Stokes equations on a 3D unstructured non-ortho gonal grid with hexahedral cells. The SIMPLE method was used for the pressu re coupling and the k-epsilon model was used to model turbulence, with a mo dification for density stratification due to the vertical temperature profi le. The results were compared with field measurements of the temperature in the lake, indicating the location of the water current. Reasonably good ag reement was found.