Dear all, do you have any experience in performing an uncertainty analysis on mesh-free simulations like SPH (smoothed particle hydrodynamics) results? Can you guide me, please.
This kind of uncertainties mainly comes from the uncertainties of parameters like restitution/friction coefficients in DEM. For SPH may be parameters such as kernel function, number of particles. The UQ is done by analysis the sensitivity of the simulation results on these parameters. The link is a UQ of DEM by Dr. Vaidheeswaran in NETL. https://mfix.netl.doe.gov/dr-vaidheeswaran-presented-vvuq-roadmap-at-the-asme-verification-and-validation-symposium/
According to my practical field (civil and environmental engineering), I would like to clarify the importance of applications DEM-CFD in research fields .
Computational Fluid Dynamics (CFD) is similar to the Finite Element Analysis (FEA), which is a more general purpose method for numerical analysis to solve structural, thermal, spectral and flux propagation problems by simplifying them.
Discrete element modeling(DEM) is being used increasingly to simulate flow in fluidized beds. These models require complex measurement techniques to provide validation for the approximations inherent in the model
DEM-CFD treats particles as individual objects governed by Newtonian physics
DEM-CFD can provide more detailed and accurate results since aspects of individual particles such as location and velocity can be monitored, and DEM-CFD does not require the introduction of parameters such as particle “viscosity” and “pressure”. The main imperfection in DEM-CFD is that it does not resolve fluid flow on the subparticle level, and thus requires a drag law to describe the fluid–particle interaction forces needed to close the momentum equations for both phases.
The two articles below can be used to clarify the answer
“Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM) Applied to Centrifuges”
Xiana Romani Fernandez, Lars Egmont Spelter and Hermann Nirschl Karlsruhe Institute of Technology, Campus South, Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Germany
“Coupled DEM-CFD Analysis of the Initiation of Internal Instability in a Gap-Graded Granular Embankment Filter “
Kenichi Kawano1 , Tom Shire2 , and Catherine O’Sullivan2,* 1Kajima Corporation, Tokyo, JAPAN 2Department of Civil and Environmental Engineering, Imperial College London, UK
Dear Isam Issa
thank you very much for your complete considerations and great references you introduced to me.
I will use these two papers for my work.
Regards.
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