Interface-resolved direct numerical simulation of vertical particulate channel flow in the turbulent regime

By Markus Uhlmann. 2008

260 citations recorded by the source corpus.

We have conducted a direct numerical simulation study of dilute turbulent particulate flow in a vertical plane channel by considering thousands of finite-size rigid particles with resolved phase interfaces. The particle diameter corresponds to approximately 11 wall units and their terminal Reynolds number is set to 136. The fluid flow with a bulk Reynolds number of 2700 is directed upward, which maintains the particles suspended on average. Two density ratios were simulated, differing by a factor of 4.5. The corresponding Stokes numbers of the two flow cases were O(10) in the near-wall region and O(1) in the outer flow. We have observed the formation of large-scale elongated streaklike structures with streamwise dimensions of the order of eight channel half-widths and cross-stream dimensions of the order of one half-width. At the same time, we have found no evidence of significant formation of particle clusters, which suggests that the large structures are due to an intrinsic instability of the flow, whic...

Subfields: Computational Mechanics, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/7792393626b062c7a7a749c55a6fa0d19813a431

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In Computational Mechanics

In Ocean Engineering

Citations in the corpus

Analyzing preferential concentration and clustering of inertial particles in turbulence (2012, background): “Very promising contributions based on a variety of numerical methods are already available (Ten Cate et al., 2004; Zhang and Prosperetti, 2005; Uhlmann, 2008; Yeo et al., 2010; Lucci et al., 2010, 2011), some of which allowing to follow four to six thousands finite size particles while resolving all”
Collision modelling for the interface-resolved simulation of spherical particles in viscous fluids (2012, methodology): “The model was successfully employed for the simulation of dilute suspensions, for example by Uhlmann (2008) in the case of a particle-laden flow in a vertical channel with = 8 × 10−4Dp/(ρf u2∞).”
Modulation of isotropic turbulence by particles of Taylor length-scale size (2010, methodology): “At present, the DNS study of Uhlmann (2008) has the largest number of fully resolved moving particles in a turbulent flow.”
An improved immersed boundary method with direct forcing for the simulation of particle laden flows (2012, methodology): “The model was successfully employed for the simulation of dilute suspensions, for example by [44] in the case of a particle-laden flow in a vertical channel with = 8 · 10−4Dp / (ρf u(2)∞).”
Direct numerical simulation of horizontal open channel flow with finite-size, heavy particles at low solid volume fraction (2013, methodology): “The numerical method has been validated on a whole range of benchmark problems (Uhlmann, 2004, 2005a,b, 2006), and has been previously employed for the simulation of several flow configurations (Uhlmann, 2008; Chan-Braun, Garćıa-Villalba, and Uhlmann, 2011; GarćıaVillalba et al., 2012).”