OMAE 2012, Rio de
Janeiro, 10-15 June
WORKSHOP
ON
VERIFICATION
AND VALIDATION
OF CFD
FOR
OFFSHORE
FLOWS
This page contains
information about the Workshop on Verification and Validation (V&V) of CFD
for Offshore Flows, to be held during OMAE2012. Information about V&V and
the main motivation of this proposal is presented here.
Three
test-cases are proposed:
I)
Code
Verification for a 3-D manufactured solution of an unsteady turbulent flow.
II)
Solution
Verification and Validation for the flow around a smooth fixed cylinder.
III)
Solution Verification and Validation for the
flow around a straked-riser.
The goal
of this Workshop is to obtain numerical predictions with their respective
error/uncertainties. Therefore, results are required for at least 3 different
grids and 3 different time steps with a minimum of 6 data points (of the
possible 9). Furthermore, grid refinement must be performed in all directions
simultaneously and ideally the grids should be geometrically similar. Numerical
errors/uncertainties are not exclusively dependent on discretization error.
However, round-off and iterative errors should be reducible to negligible
levels when compared to the discretization error. In complex turbulent flows,
this usually requires the use of 15 digits precision and iterative convergence
criteria must be carefully selected to ensure that numerical uncertainties are
mainly due to discretization errors.
Naturally, solutions provided in a single grid with a single time step are
useless for the present exercise.
Contributions
to this Workshop include a paper for the V&V Workshop OMAE2012 session
describing the calculations of at least one of the proposed test-cases, reply
to a questionnaire and data sheets including the requested flow quantities for
at least 6 different calculations using at least 3 grids and 3 time steps. The
questionnaire and the data sheets can be found in the links (above) to the
pages with detailed information about each of the proposed test cases.
The papers
should be submitted in the standard framework of the OMAE 2012 Conference. Data
sheets and the questionnaire for the comparisons to be presented at the
Workshop can be sent to eca@marine.ist.utl.pt until the end of April 2012.
Summary
report of the Workshop is available here.