Journal ArticleDOI
Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil
TLDR
In this paper, the authors investigated the feasibility of various Richardson extrapolation-based uncertainty estimators in the cavitating flow simulation, including the modified Factor of Safety (FS1), the Factor of safety (FS), and the Grid Convergence Index (GCI).Abstract:
In this paper, we investigate the verification and validation (V&V) procedures for the URANS simulations of the turbulent cavitating flow around a Clark-Y hydrofoil. The main focus is on the feasibility of various Richardson extrapolation-based uncertainty estimators in the cavitating flow simulation. The unsteady cavitating flow is simulated by a density corrected model (DCM) coupled with the Zwart cavitation model. The estimated uncertainty is used to evaluate the applicability of various uncertainty estimation methods for the cavitating flow simulation. It is shown that the preferred uncertainty estimators include the modified Factor of Safety (FS1), the Factor of Safety (FS) and the Grid Convergence Index (GCI). The distribution of the area without achieving the validation at the Vv level shows a strong relationship with the cavitation. Further analysis indicates that the predicted velocity distributions, the transient cavitation patterns and the effects of the vortex stretching are highly influenced by the mesh resolution.read more
Citations
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Journal ArticleDOI
Tip clearance on pressure fluctuation intensity and vortex characteristic of a mixed flow pump as turbine at pump mode
Yabin Liu,Lei Tan +1 more
TL;DR: In this paper, the authors investigated the pressure fluctuation intensity and vortex characteristic of a mixed flow pump as turbine at pump mode with a tip clearance, and showed that the tip leakage vortex (TLV) can be divided into four categories, namely, primary TLV, secondary TLV and entangled TLV.
Journal ArticleDOI
Large eddy simulation and Euler–Lagrangian coupling investigation of the transient cavitating turbulent flow around a twisted hydrofoil
TL;DR: In this paper, a 3D Lagrangian Coherent Structures (LCS) was used to analyze the dynamics of cavitation-vortex interactions in the Delft twisted hydrofoil.
Journal ArticleDOI
Verification and validation of Large Eddy Simulation of attached cavitating flow around a Clark-Y hydrofoil
TL;DR: In this paper, the authors used implicitly filtered large eddy simulation with a homogenous cavitation model to investigate the transient turbulent cavitating flow around a Clark-Y hydrofoil with emphasis on Verification and Validation (V&V).
Journal ArticleDOI
Entropy generation analysis for the cavitating head-drop characteristic of a centrifugal pump:
TL;DR: In this paper, the authors analyzed the cavitating flow at a normal flow rate using torsion flow analysis and showed that cavitation is a challenging flow abnormality that leads to undesirable effects on the hydraulic behavior of centrifugal pumps.
Journal ArticleDOI
Numerical modelling of unsteady cavitation and induced noise around a marine propeller
TL;DR: In this paper, the authors used the k-ω SST turbulence model with the turbulence viscosity correction and the Zwart cavitation model to simulate the cavitating flow around a propeller in a non-uniform wake.
References
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Book
Verification and Validation in Scientific Computing
TL;DR: A comprehensive and systematic development of the basic concepts, principles, and procedures for verification and validation of models and simulations that are described by partial differential and integral equations and the simulations that result from their numerical solution.
Journal ArticleDOI
Comprehensive Approach to Verification and Validation of CFD Simulations—Part 1: Methodology and Procedures
TL;DR: This work presents a comprehensive approach to verification and validation methodology and procedures for CFD simulations from an already developed CFD code applied without requiring availability of the source code for specified objectives, geometry, conditions, and available benchmark information.
Journal ArticleDOI
Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation
TL;DR: In this article, a simulation of turbulent cavitation in a Venturi-type section was performed by two-dimensional computations of viscous, compressible, and turbulent cavitating flows.