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date: '2015-01-01' | ||
journal: Notes on Numerical Fluid Mechanics and Multidisciplinary Design | ||
publisher: Springer [email protected] | ||
scopus_cite: 2 | ||
scopus_cite: 3 | ||
pub_type: Article | ||
auto_content: yes # DELETE THIS TO NOT AUTO GENERATE CONTENT | ||
auto_data: yes # DELETE THIS TO NOT AUTO GENERATE METADATA | ||
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date: '2016-06-01' | ||
journal: Experiments in Fluids | ||
publisher: Springer [email protected] | ||
scopus_cite: 10 | ||
scopus_cite: 14 | ||
pub_type: Article | ||
auto_content: yes # DELETE THIS TO NOT AUTO GENERATE CONTENT | ||
auto_data: yes # DELETE THIS TO NOT AUTO GENERATE METADATA | ||
|
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Original file line number | Diff line number | Diff line change |
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--- | ||
doi: 10.1016/j.anucene.2024.110467 | ||
title: 'Pipe to annular flow conversion: Numerical study' | ||
authors: | ||
- P Prusinski | ||
- S Kubacki | ||
keywords: | ||
- detached boundary layer | ||
- flow through sudden contraction | ||
- helical oblique stripes | ||
- large eddy simulation (les) | ||
- nuclear fuel rods | ||
- separation bubble | ||
date: '2024-07-01' | ||
journal: Annals of Nuclear Energy | ||
publisher: Elsevier Ltd | ||
scopus_cite: 0 | ||
pub_type: Article | ||
auto_content: yes # DELETE THIS TO NOT AUTO GENERATE CONTENT | ||
auto_data: yes # DELETE THIS TO NOT AUTO GENERATE METADATA | ||
redirect: https://doi.org/10.1016/j.anucene.2024.110467 # DELETE THIS TO NOT REDIRECT | ||
realauthors: | ||
- P Prusinski: P. Prusiński | ||
- S Kubacki: S. Kubacki | ||
--- | ||
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## Abstract | ||
Large Eddy Simulation (LES) of turbulent flow at the entrance to an annular pipe section has been performed. The flow over a single circular rod, coaxially immersed in a circular pipe is considered. The Reynolds number, based on mean velocity and hydraulic diameter of the annular section, is ReDh=40530. The study aims to gain insights into the turbulence characteristics of the primary and secondary separation bubbles, developing on a side surface of the rod. Key findings include tiny toroidal vortices in the primary bubble's front, forming a vortex train with intermittently shed vortex structures. Large-scale helical stripes have been reproduced at the entrance to the annular section. Tilting of the axially-oriented streaks was observed close to the rod surface. It resulted in a slight anisotropy of the normal Reynolds stresses. The LES data could refine classic Reynolds-averaged Navier-Stokes-based turbulence models. |
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--- | ||
doi: 10.1016/j.applthermaleng.2023.121944 | ||
title: Numerical investigation of the effect of nanoparticle aggregation on the performance | ||
of concentrated photovoltaic-solar thermal collectors with spectral filtering | ||
authors: | ||
- J Mojumder | ||
- T Mitchell | ||
- S Aminossadati | ||
- C Leonardi | ||
keywords: | ||
- agglomeration | ||
- cpv/t | ||
- eulerian-mixture model | ||
- nanofluid | ||
- solar collector | ||
date: '2024-02-15' | ||
journal: Applied Thermal Engineering | ||
publisher: Elsevier Ltd | ||
scopus_cite: 2 | ||
pub_type: Article | ||
auto_content: yes # DELETE THIS TO NOT AUTO GENERATE CONTENT | ||
auto_data: yes # DELETE THIS TO NOT AUTO GENERATE METADATA | ||
redirect: https://doi.org/10.1016/j.applthermaleng.2023.121944 # DELETE THIS TO NOT REDIRECT | ||
realauthors: | ||
- J Mojumder: J.C. Mojumder | ||
- T Mitchell: T.R. Mitchell | ||
- S Aminossadati: S.M. Aminossadati | ||
- C Leonardi: C.R. Leonardi | ||
--- | ||
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## Abstract | ||
Solar energy, particularly solar thermal technology, has gained popularity as a possible long-term replacement to fossil fuels. The application of concentrated photovoltaic-solar thermal (CPV/T) collectors, which are improved by spectral filter fluids (SFF) and nanotechnology, has the potential to provide both higher thermal power for heating and cooling as well as improved electrical power generation. This work contributes new insight by quantifying the influence of nanoparticle agglomeration on collector performance and highlighting the challenges associated with the heterogeneous distribution of nanoparticles in CPV/T systems. The study employed coupled Eulerian multiphase modeling and discrete ordinate (DO) radiation modeling to examine slip velocity, nanoparticle diameter (including agglomeration), and suspension concentration. Population balance modeling (PBM) was utilized to determine the nanoparticle size distribution, and the obtained results were validated through comparison with experimental and numerical studies. When neglecting the effect of agglomeration and breakage of the non-solar participating media, the maximum error for this configuration was found to be 3.58% when compared to experimental work. From the solar participating study, in terms of electrical energy production, the best performance obtained was 16.64% with a volume fraction of 0.005% when considering agglomeration and breakage. It was also found that the Sauter diameter increases with volume fraction as the tendency for nanoparticle agglomeration increases. This study provides a broader view of the application of multiphase modeling in solar participating and non-solar participating media and, additionally, provides insight on the effect of various boundary conditions on the key system performance indicators. To extend this work, the flow Reynolds number can be increased in addition to varying the type of working fluid. |
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--- | ||
doi: 10.1016/j.camwa.2023.05.020 | ||
title: Revisiting the second-order convergence of the lattice Boltzmann method with | ||
reaction-type source terms | ||
authors: | ||
- G Gruszczynski | ||
- M Dzikowski | ||
- L Laniewski-Wollk | ||
keywords: | ||
- lattice boltzmann method | ||
- reaction equation | ||
- second-order convergence | ||
- source term | ||
date: '2023-08-15' | ||
journal: Computers and Mathematics with Applications | ||
publisher: Elsevier Ltd | ||
scopus_cite: 1 | ||
pub_type: Article | ||
auto_content: yes # DELETE THIS TO NOT AUTO GENERATE CONTENT | ||
auto_data: yes # DELETE THIS TO NOT AUTO GENERATE METADATA | ||
redirect: https://doi.org/10.1016/j.camwa.2023.05.020 # DELETE THIS TO NOT REDIRECT | ||
realauthors: | ||
- G Gruszczynski: G. Gruszczyński | ||
- M Dzikowski: M. Dzikowski | ||
- L Laniewski-Wollk: Ł. Łaniewski-Wołłk | ||
--- | ||
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## Abstract | ||
This study analyses an approach to consistently recover the second-order convergence of the lattice Boltzmann method (LBM), which is frequently degraded by an improper discretisation of the required source terms. The current work focuses on advection-diffusion models, in which the source terms are dependent on the intensity of transported fields. Such terms can be observed in reaction-type equations used in heat and mass transfer problems or multiphase flows. The investigated scheme is applicable to a wide range of formulations within the LBM framework. All considered source terms are interpreted as contributions to the zeroth-moment of the distribution function. These account for sources in a scalar field, such as density, concentration, temperature or a phase field. Further application of this work can be found in the method of manufactured solutions or in the immersed boundary method. This paper is dedicated to three aspects regarding proper inclusion of the source term in LBM schemes. Firstly, it identifies the differences observed between the ways in which source terms are included in the LBM schemes present in the literature. The algebraic manipulations are explicitly presented in this paper to clarify the observed differences, and to identify their origin. Secondly, it analyses in full detail, the implicit relation between the value of the transported macroscopic field, and the sum of the LBM densities. This relation is valid for any source term discretization scheme. It is a crucial ingredient for preserving the second-order convergence in the case of complex source terms. Moreover, three equivalent forms of the second-order accurate collision operator are presented. Finally, closed form solutions of this implicit relation are shown for a variety of common models, including general linear and second order terms; population growth models, such as the Logistic or Gompertz model and the Allen-Cahn equation. The second-order convergence of the proposed LBM schemes is verified on both linear and non-linear source terms. The pitfalls of the commonly used acoustic and diffusive scalings are identified and discussed. Furthermore, for a simplified case, the competing errors are shown visually with isolines of error in the space of spatial and temporal resolutions. |
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