In this simulation, the gravity vector points in the negative x -direction. The x and z boundaries are periodic, while the y boundaries have zero fluid velocity since the y -boundaries represent the inside surfaces of the window panes. This simulation required 2.4 million degrees of freedom to simulate all the essential scales of turbulent fluid motion. This calculation ran on 32 Intel Delta compute nodes and required 78,000 time steps to calculate steady second moment temporal statistics. Instantaneous realization of the temperature field in the turbulent air space of a double-pane window.
Gravity is in the negative x direction.
Besides the instantaneous temperature and velocity vector fields, the code computes important temporal statistical correlations such as the Reynolds stresses. At present, the PNL researcher is calculating a turbulent flow for a Grashof number of 22,500, with about 15 million degrees of freedom using 128 Delta compute nodes. Future calculations will include a larger case on 256 compute nodes for a Grashof number of 90,000, with about 119 million degrees of freedom. Additional effects that will be included in future calculations are stratification and angle of window inclination. Acknowledgments Access to the Delta was provided by Pacific Northwest Laboratory.