Abstract
Verification and validation methodology is presented for CFD simulation results from an already developed RANS CFD code applied for specified objectives, geometry, conditions, and available benchmark information. Concepts and definitions are provided for errors and uncertainties and verification and validation. The simulation error and uncertainty equations are derived with modeling and numerical errors being additive and modeling and numerical uncertainties combining by root-sum-square. The concepts, definitions, and equations are fundamental to the verification and validation methodologies. Verification methodology extends previous work and puts it on a more firm foundation. Iterative and parameter convergence studies are conducted using multiple solutions with systematic parameter refinement to estimate numerical errors and/or uncertainties. Three convergence conditions are possible: (i) converging; (ii) oscillatory; and (iii) diverging. For condition (i), generalized Richardson extrapolation for J input parameters and accounting for the effects of the higher-order terms is used to estimate uncertainties and, when conditions permit, the numerical error itself. For condition (ii), the upper and lower bounds of the solution oscillation are used to estimate uncertainties. For condition (iii), errors and/or uncertainties can not be estimated. Validation methodology follows Coleman and Stern published in 1997. An example is provided for a RANS CFD code and results for steady flow for a cargo/container ship.
| Original language | English |
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| Title of host publication | Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) |
| Publisher | American Society of Mechanical Engineers |
| Pages | 1 |
| Number of pages | 1 |
| ISBN (Print) | 0791819612 |
| State | Published - 1999 |
| Externally published | Yes |