"Quantifying Uncertainties from the GRID in CFD Solutions"
October 7 @ 3:00 PM - 4:00 PM - BRK 1001
For most users of CFD, the mesh and the time-step size are the only parts of the solution procedure in which the user has full control. The mesh used must represent the geometry and enable the algebraic analog of the governing PDEs to resolve the relevant flow physics. For realistic engineering problems, the number of grid points or cells that can be used is restricted by either the available computer resource or a need to have a practical turn-around time in generating a solution. With such a constraint, accuracy demands grid points to be placed in regions where they are most needed to resolve the geometry and flow physics (e.g., by r- or h-refinement). Unfortunately, this non-uniform distribution could create what are referred to as poor-quality cells, which can induce considerable errors in the computed solutions. In addition, it is generally not feasible to do a grid-independent study so that there could be errors from poor quality cells and from inadequate resolution.
- Bonnie Kauffman