Verification of transport equations in a general purpose commercial CFD code.

28th IAHR symposium on Hydraulic Machinery and Systems

Melot, Matthieu^1 ; Nennemann, Bernd^2 ; Deschènes, Claire^1

LAMH, Mechanical Engineering Department, Universite Laval, 1065 avenue de la médecine, QC

G1V 0A6, Canada^1

Andritz Hydro Canada Inc., 6100 Transcanada Highway, Pointe-Claire

QC

H9R 1B9, Canada^2

关键词: ALE formulation;    CFD simulations;    Code verification;    Eulerian-lagrangian;    Temporal order;    Transient formulations;    Transport equation;    Verification-and-validation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/6/062008/pdf
DOI  :  10.1088/1755-1315/49/6/062008

来源: IOP

【 摘 要 】

In this paper, the Verification and Validation methodology is presented. This method aims to increase the reliability and the trust that can be placed into complex CFD simulations. The first step of this methodology, the code verification is presented in greater details. The CFD transport equations in steady state, transient and Arbitrary Eulerian Lagrangian (ALE, used for transient moving mesh) formulations in Ansys CFX are verified. It is shown that the expected spatial and temporal order of convergence are achieved for the steady state and the transient formulations. Unfortunately this is not completely the case for the ALE formulation. As for a lot of other commercial and in-house CFD codes, the temporal convergence of the velocity is limited to a first order where a second order would have been expected.