Accuracy and uncertainty in flow simulation December

Peter

Description

Accuracy and uncertainty in flow simulation 3 December 2010 Solution Verification: Overview of the Lisbon Workshops L. Eça (Instituto Superior Técnico, TU Lisbon)

• workshops overview


• instituto superior


• subsequent tests performed


• final remarks


• averaged rans


• equations ended


• lisbon workshops

Sujets

• Hoekstra
• Instituto superior

Informations

• Publié par: pefav
• Nombre de lectures: 8
• Langue: English
• Poids de l'ouvrage: 2 Mo

Extrait

Accuracy and uncertainty in flow simulation 3 December 2010 Solution Verification: Overview of the Lisbon Workshops L. Eça (Instituto Superior Técnico, TU Lisbon)

Accuracy and uncertainty in flow simulation 3 December 2010 Everything included in this presentation is joint work with M. Hoekstra from the Maritime Research Institute Netherlands and it is part of an on going cooperation between MARIN and IST

Contents 1.Motivation Accuracy and uncertainty in flow simulation 2. Numerical error/uncertainty 3. Workshops overview 4. Extra results 5. Final Remarks 3 December 2010

1.Motivation Accuracy and uncertainty in flow simulation 3 December 2010 -In 1998/99 the ITTC resistance committee started a “debate” about a “standard” procedure for the estimation of the error/uncertainty of a numerical solution -The proposed procedure was based on Richardson extrapolation which is also the basis of the G.C.I. proposed by Patrick J. Roache -The estimation of the error/uncertainty requires three numerical solutions in the “asymptotic range”

1.Motivation Accuracy and uncertainty in flow simulation 3 December 2010 -Our initial tests were performed for calculation of the flow around a model scale tanker with the time-averaged RANS equations ended with a set of 24 grids and a lot of scatter in the data -Subsequent tests performed for simplest problems (Laplace equation, laminar driven cavity) showed that the problem is not trivial and that some issues have to be dealt with carefully (grid similarity, attaining the “asymptotic range”, post-processing,)…