I am trying large-scale flow simulation using XFlow GPU solver.

The analysis conditions are single phase, external and isothermal.

The domain type is a virtual wind tunnel with 8000m*6000m*1000m sizes, and the geometry with *.stl format is imported.

In the wind tunnel, Ground wall is deactivated and the boundary conditions are velocity inlet and periodic condition(lateral).

The initial velocity fields are set to 0 m/s(xyz) and the initial gauge pressure is set to 'z*rho*9.81' Pa for flow stabilization. 

The domain generation has been completed successfully.

After domain generation, an error is occurring and the solving is not working.

The error code is [-1073741819::1(in Message view, exit code)], and there is no explanation even in the User Guide.

I don't know why the solving process is not working.

Is there anyone who can explain this error to me?