Simulation of particulate matter structure detachment from surfaces of wall-flow filters applying lattice Boltzmann methods

Hafen, Nicolas; Dittler, Achim; Krause, Mathias J.

doi:10.1016/j.compfluid.2022.105381

Cited by 9 publications

(15 citation statements)

References 30 publications

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“…Analogously to previous work (Hafen et al 2022), a Bhatnagar-Gross-Krook (BGK) collision operator (Bhatnagar et al 1954) with a lattice relaxation time of τ = 0.51, i.e.…”

Section: Lattice Boltzmann Methodsmentioning

confidence: 92%

“…When additionally adopting the commonly used choice of , the LBE reads Analogously to previous work (Hafen et al. 2022), a Bhatnagar–Gross–Krook (BGK) collision operator (Bhatnagar et al. 1954) with a lattice relaxation time of , i.e.…”

Section: Modelling Approach and Numerical Methodsmentioning

confidence: 99%

“…After having reached the actual specified inflow velocity, both the pressure and the velocity convergence of the whole fluid field are evaluated in reoccurring steps to ensure no left-over effects of the artificial start-up process. Analogously to Hafen et al (2022), the convergence of a generic flow quantity χ is determined by evaluating whether the standard deviation σ of the quantity becomes smaller than a predefined residuum r multiplied by the average χ over the last T time steps:…”

Section: Simulation Run Executionmentioning

confidence: 99%

“…(2021) present an improved version of the homogenized lattice Boltzmann method (HLBM), which is used as the surface-resolved particle approach in the previous work (Hafen et al. 2022). Here, the three-dimensional (3-D) case of a sedimenting sphere at different Reynolds numbers, the pinch effect discovered by Segré & Silberberg (1961, 1962) and the process of swarm sedimentation were examined and compared with literature data.…”

Section: Introductionmentioning

confidence: 99%

“…It additionally refers to a comprehensive summary of experimental works focusing on filter ash by Wang et al (2020) and a detailed review of wall-flow simulation approaches by Yang et al (2016). In a recent study, Trunk et al (2021) present an improved version of the homogenized lattice Boltzmann method (HLBM), which is used as the surface-resolved particle approach in the previous work (Hafen et al 2022). Here, the three-dimensional (3-D) case of a sedimenting sphere at different Reynolds numbers, the pinch effect discovered by Segré & Silberberg (1961, 1962 and the process of swarm sedimentation were examined and compared with literature data.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of detachment and transport of particulate structures in wall-flow filters using lattice Boltzmann methods

et al. 2023

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The exhaust from combustion engines contains particulate matter (PM), which poses potential health risks to human lungs. Current emission laws place increasingly strict limitations on both PM and particle number, leading to the necessity of using wall-flow filters to separate out a significant amount of the introduced PM. As this leads to an increase in the filter's loading, it is regenerated continuously or periodically, leading to the rearrangement of individual particulate structures inside the filter channels. Such rearrangement events cause the formation of specific deposition patterns, which affect the filter's pressure drop, its loading capacity and the separation efficiency. In order to derive predictions on the formation of specific deposition patterns, the transient behaviour of individual particle structures needs to be examined. The present work investigates the detachment and transport of particle structures during filter regeneration with three-dimensional surface-resolved simulations using a lattice Boltzmann method. The goal of this work is the determination of relevant key quantities and their interpretation with respect to predictions regarding the resulting deposition patterns. In this context, it is shown that lift forces are not the predominant detachment forces for non-spherical particle structures, and that the stopping distance of such structures is too long to avoid back-end deposition.

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“…Analogously to previous work (Hafen et al 2022), a Bhatnagar-Gross-Krook (BGK) collision operator (Bhatnagar et al 1954) with a lattice relaxation time of τ = 0.51, i.e.…”

Section: Lattice Boltzmann Methodsmentioning

confidence: 92%