猪苗代湖の吹送流および河川流シミュレーション  [in Japanese] Simulation of Currents in the Lake Inawashiro Driven by Wind and Inflows from Rivers  [in Japanese]

The finite element fluid flow analyses to simulate currents in the Lake Inawashiro are conducted. The geometry model and finite element meshes of the lake are generated by using a newly developed method that is presented in this paper. In this method, the moving least square method is used to interpolate the sampling points on contour lines. The fluid flow analyses based on the shallow water equations (SWE analyses) and a preliminary 3D incompressible viscous flow analysis (3D analysis) are conducted. Some parameters and boundary conditions used in the analyses are based on observation data. Movement of acid water that comes from the Nagase River is simulated by the analyses. The preliminary 3D analysis is conducted for evaluating the size of the mesh and computation time of realistic fully 3D simulation. The present geometry modeling method is implemented by using preprocessors in the system of open source software for the parallel finite element (FE) analyses, ADVENTURE. The finite element fluid flow analyses are performed by using existing parallel codes. The code for the 3D analysis is a module of the ADVENTURE system. The code for the SWE analysis will be open to the public as a module of the system in the future.