Chapter 7
Grid Independence Tests
Publication: Computational Fluid Dynamics Modeling in Water Infrastructure: Best Practices
Abstract
Many factors contribute to the results of CFD. The simulation should be designed in a way such that the targeted observation is free of or has the minimum impact of numerical configuration, such as mesh and boundary condition. One of the most important factors in this consideration is the computational mesh. It will be demanded to eliminate the impact of grid resolution and configuration on the targeted physics. A common practice to detect the presence of such impact is called grid independence. In general, different resolutions and/or configurations of grids are used to repeat the same simulation. The key to determining if a CFD solution is grid independent is to use significantly different grid resolutions to evaluate the targeted observation. Wang et al. performed a series of CFD studies to investigate the penetration of starting buoyant jets. The computational domain and the boundary conditions are shown.
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References
Celik, I. B., U. Ghia, P. J. Roache, and C. J. Freitas. 2008. “Procedure for estimation and reporting of uncertainty due to discretization in CFD applications.” J. Fluids Eng. Trans. ASME 130 (7): 078001.
Cockx, A., Z. Do-Quang, J. M. Audic, A. Liné, et al. 2001. “Global and local mass transfer coefficients in wastewater treatment process by computational fluid dynamics.” Chem. Eng. Process 40 (2): 187–194.
Fayolle, Y., A. Cockx, S. Gillot, M. Roustan, et al. 2007. “Oxygen transfer prediction in aeration tanks using CFD.” Chem. Eng. Sci. 62 (24): 7163–7171.
Wang, R. Q., A. W. K. Law, E. E. Adams, and O. B. Fringer. 2011. “Large-eddy simulation of starting buoyant jets.” Environ. Fluid Mech. 11 (6): 591–609.
Information & Authors
Information
Published In
Computational Fluid Dynamics Modeling in Water Infrastructure: Best Practices
Pages: 37 - 40
Editor: Yovanni A. Cataño-Lopera, Ph.D., P.E., D.WRE
ISBN (Online): 978-0-7844-8512-5
Copyright
© 2023 American Society of Civil Engineers.
History
Published online: Oct 3, 2023
ASCE Technical Topics:
- Boundary conditions
- Boundary value problem
- Computational fluid dynamics technique
- Differential equations
- Engineering fundamentals
- Equations (by type)
- Fluid dynamics
- Fluid mechanics
- Grid systems
- Hydraulic engineering
- Hydrologic engineering
- Hydromechanics
- Jets (fluid)
- Mathematics
- Models (by type)
- Numerical models
- Systems engineering
- Systems management
- Water and water resources
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