By F. Menter, B. Hemstrom
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Extra resources for CFD Best Practice Guidelines for CFD Code Validation for Reactor- Safety Applications
4. CFD Model • • • • • • • • • Description of the CFD method. Description of the spatial and temporal discretisation. Description of the modelled geometry (symmetry, omission of details). Grid Generation. Description of numerical grids (size, structure, problems). Selected and applied models. Which models are used (turbulence models, assumptions, model errors, alternatives). Physical Properties. Which boundary conditions are used (simplifications, assumptions). 45 5. Solution Strategy • • • • Strategy for estimation and reduction of iteration errors.
Moreover, even if error estimates are available, they cannot exclude systematic errors by the experimentalist. In addition to error bounds, it is therefore desirable to have an overlap of experimental data, which allow testing the consistency of the measurements. Examples are the same data from different experimental techniques. It is also a quality criterion when different experimental groups in different facilities have carried out the same experiment. Consistency can also be judged from total balances, like mass, momentum and energy conservation.
Iteration Errors Is information on the residual reduction available. Are the global balances satisfied. 42 • • Has the influence of the residual reduction on target variables been demonstrated. Is a satisfactory level of convergence achieved. 2. • • • • • • • Spatial Discretisation Errors Is the order of the scheme given in the simulation report. Is the order of the scheme sufficient for the simulation (usually at least of second order). Has a systematic grid refinement process been carried out, and how many grids have been used.
CFD Best Practice Guidelines for CFD Code Validation for Reactor- Safety Applications by F. Menter, B. Hemstrom