Berend G M van Wachem

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Berend G M van Wachem
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Fabian Denner (9)
Fabien Evrard (8)
Sanaz Mostaghim (4)
Christian Gorges (2)
Hani Elmestikawy (2)
Julia H Reuter (2)
Max Hausmann (2)
A F Bakker (1)
Andreas Mark (1)
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Heiner Zille (1)
Iffat Jamil (1)
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M W Heemels (1)
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S W De Leeuw (1)
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2022 IEEE Congress on Evolutionary Computation (CEC) (1)
GECCO '21: Proceedings of the Genetic and Evolutionary Computation Conference Companion (1)
GECCO '23 Companion: Proceedings of the Companion Conference on Genetic and Evolutionary Computation (1)
Genetic Programming (1)

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research-article
Undisturbed velocity recovery with transient and weak inertia effects in volume-filtered simulations of particle-laden flows
- Fabien Evrard
  Department of Aerospace Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801, United States
  ,
- Akshay Chandran
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany
  ,
- Ricardo Cortez
  Department of Mathematics, Tulane University, New Orleans, LA 70118, United States
  ,
- Berend van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 523, Issue C•Feb 2025 • https://doi.org/10.1016/j.jcp.2024.113684
Abstract
In volume-filtered Euler-Lagrange simulations of particle-laden flows, the fluid forces acting on a particle are estimated using reduced models, which rely on the knowledge of the local undisturbed flow for that particle. Since the two-way ...
Highlights

New model for a particle's self-induced velocity disturbance in VF-EL modeling.
The proposed model resolves the transient development of the flow disturbance.
The proposed model can consider particles evolving at finite Reynolds ...
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Physically consistent immersed boundary method: A framework for predicting hydrodynamic forces on particles with coarse meshes
- Max Hausmann
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Hani Elmestikawy
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Berend van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 519, Issue C•Dec 2024 • https://doi.org/10.1016/j.jcp.2024.113448
Abstract
In the present paper, a fluid-particle coupling method is directly derived from the Navier-Stokes equations (NSE) by applying the concept of volume-filtering, yielding a physically consistent methodology to incorporate solid wall boundary ...
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New immersed boundary method based on volume-filtering.
Predict hydrodynamic forces on particles accurately with coarse fluid resolutions.
Physical explanation of flow inside particles.
Converges to large eddy simulation far ...
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Efficient reduction of vertex clustering using front tracking with surface normal propagation restriction
- Christian Gorges
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Azur Hodžić
  Department of Civil and Mechanical Engineering, Technical University of Denmark, Anker Engelunds Vej 1, Kgs. Lyngby, 2800, Denmark
  ,
- Fabien Evrard
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, United States of America
  ,
- Berend van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Clara M. Velte
  Department of Civil and Mechanical Engineering, Technical University of Denmark, Anker Engelunds Vej 1, Kgs. Lyngby, 2800, Denmark
  ,
- Fabian Denner
  Department of Mechanical Engineering, Polytechnique Montréal, Montréal, H3T 1J4, QC, Canada
Journal of Computational Physics, Volume 491, Issue C•Oct 2023 • https://doi.org/10.1016/j.jcp.2023.112406
Abstract
A significant computational expense and source of numerical errors in front tracking is the remeshing of the triangulated front, required due to distortion and compaction of the front following the Lagrangian advection of its vertices. ...
Highlights

Front tracking with vertex advection only in the direction normal to the interface.
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Landscape Analysis of Multi-objective Control of Fluidized Beds
- Iffat Jamil
  Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
  ,
- Sanaz Mostaghim
  Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
  ,
- Berend Van Wachem
  Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
  ,
- Victor Chéron
  Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
  ,
- Max Hausmann
  Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
GECCO '23 Companion: Proceedings of the Companion Conference on Genetic and Evolutionary Computation•July 2023, pp 1950-1955• https://doi.org/10.1145/3583133.3596384

Fluidized beds are widely used in various industrial applications that require efficient mixing, heat and mass transfer between gas and solid particles. This paper explores the relationship between input parameters of inlet gas velocity into the ...
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Article
Graph Networks as Inductive Bias for Genetic Programming: Symbolic Models for Particle-Laden Flows
- Julia Reuter
  Institute for Intelligent Cooperating Systems, Otto-von-Guericke-University, Magdeburg, Germany
  ,
- Hani Elmestikawy
  Institute for Mechanical Process Engineering, Otto-von-Guericke-University, Magdeburg, Germany
  ,
- Fabien Evrard
  Institute for Mechanical Process Engineering, Otto-von-Guericke-University, Magdeburg, Germany
  ,
- Sanaz Mostaghim
  Institute for Intelligent Cooperating Systems, Otto-von-Guericke-University, Magdeburg, Germany
  ,
- Berend van Wachem
  Institute for Mechanical Process Engineering, Otto-von-Guericke-University, Magdeburg, Germany
Genetic Programming•April 2023, pp 36-51• https://doi.org/10.1007/978-3-031-29573-7_3
Abstract
High-resolution simulations of particle-laden flows are computationally limited to a scale of thousands of particles due to the complex interactions between particles and fluid. Some approaches to increase the number of particles in such ...
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Towards Improving Simulations of Flows around Spherical Particles Using Genetic Programming
- Julia Reuter
  Otto-von-Guericke-University Magdeburg,Faculty of Computer Science,Germany
  ,
- Manoj Cendrollu
  Faculty of Process Engineering
  ,
- Fabien Evrard
  Faculty of Process Engineering
  ,
- Sanaz Mostaghim
  Otto-von-Guericke-University Magdeburg,Faculty of Computer Science,Germany
  ,
- Berend van Wachem
  Faculty of Process Engineering
2022 IEEE Congress on Evolutionary Computation (CEC)•July 2022, pp 1-8• https://doi.org/10.1109/CEC55065.2022.9870301
The simulation of particle-laden flows is a crucial task in fluid dynamics, requiring high computational cost owing to the complex interactions between numerous particles. Typically, the flow velocity is described with the equations proposed by Stokes. ...
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Breaching the capillary time-step constraint using a coupled VOF method with implicit surface tension
- Fabian Denner
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Fabien Evrard
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Berend van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 459, Issue C•Jun 2022 • https://doi.org/10.1016/j.jcp.2022.111128
Abstract
The capillary time-step constraint is the dominant limitation on the applicable time-step in many simulations of interfacial flows with surface tension and, consequently, governs the execution time of these simulations. We propose a ...
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Fully-coupled pressure-based algorithm for interfacial flows with implicitly coupled VOF method.
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Reducing volume and shape errors in front tracking by divergence-preserving velocity interpolation and parabolic fit vertex positioning
- Christian Gorges
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Fabien Evrard
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Berend van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Fabian Denner
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 457, Issue C•May 2022 • https://doi.org/10.1016/j.jcp.2022.111072
Abstract
Volume conservation and shape preservation are two well-known issues related to the advection and remeshing in front tracking. To address these issues, this paper proposes a divergence-preserving velocity interpolation method and a ...
Highlights

Introduction of divergence-preserving velocity interpolation for front tracking.
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Published By ACM
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Unit-aware multi-objective genetic programming for the prediction of the stokes flow around a sphere
- Heiner Zille
  Otto von Guericke University Magdeburg
  ,
- Sanaz Mostaghim
  Otto von Guericke University Magdeburg
  ,
- Fabien Evrard
  Otto von Guericke University Magdeburg
  ,
- Berend van Wachem
  Otto von Guericke University Magdeburg
GECCO '21: Proceedings of the Genetic and Evolutionary Computation Conference Companion•July 2021, pp 327-328• https://doi.org/10.1145/3449726.3459408

In this article we apply a unit-aware Genetic Programming (GP) approach to solve a problem from the area of fluid-dynamics: The Stokes flow around a sphere. We formulate 6 test instances with different complexities and explore the capabilities of single-...
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erratum
Corrigendum to “Pressure-based algorithm for compressible interfacial flows with acoustically-conservative interface discretisation” [J. Comput. Phys. 367 (2018) 192–234]
- Fabian Denner
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  ,
- Berend G.M. van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 381, Issue C•Mar 2019, pp 290-291 • https://doi.org/10.1016/j.jcp.2018.11.017
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research-article
Pressure-based algorithm for compressible interfacial flows with acoustically-conservative interface discretisation
- Fabian Denner
  Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Cheng-Nian Xiao
  Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Berend G.M. van Wachem
  Chair of Mechanical Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Journal of Computational Physics, Volume 367, Issue C•Aug 2018, pp 192-234 • https://doi.org/10.1016/j.jcp.2018.04.028
Abstract
A pressure-based algorithm for the simulation of compressible interfacial flows is presented. The algorithm is based on a fully-coupled finite-volume framework for unstructured meshes with collocated variable arrangement, in which the ...
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A novel pressure-based algorithm for the simulation of compressible interfacial flows is proposed.
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Estimation of curvature from volume fractions using parabolic reconstruction on two-dimensional unstructured meshes
- Fabien Evrard
  Imperial College London, Department of Mechanical Engineering, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Fabian Denner
  Imperial College London, Department of Mechanical Engineering, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Berend van Wachem
  Imperial College London, Department of Mechanical Engineering, Exhibition Road, London, SW7 2AZ, United Kingdom
Journal of Computational Physics, Volume 351, Issue C•December 2017, pp 271-294 • https://doi.org/10.1016/j.jcp.2017.09.034

This paper proposes a method to estimate the curvature of an interface represented implicitly by discrete volume fractions on an unstructured two-dimensional mesh. The method relies on the computation of local parabolic reconstructions of the interface. ...
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TVD differencing on three-dimensional unstructured meshes with monotonicity-preserving correction of mesh skewness
- Fabian Denner
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Berend G.M. van Wachem
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
Journal of Computational Physics, Volume 298, Issue C•October 2015, pp 466-479 • https://doi.org/10.1016/j.jcp.2015.06.008

Total variation diminishing (TVD) schemes are a widely applied group of monotonicity-preserving advection differencing schemes for partial differential equations in numerical heat transfer and computational fluid dynamics. These schemes are typically ...
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Numerical time-step restrictions as a result of capillary waves
- Fabian Denner
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Berend G.M. van Wachem
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
Journal of Computational Physics, Volume 285, Issue C•March 2015, pp 24-40 • https://doi.org/10.1016/j.jcp.2015.01.021

The propagation of capillary waves on material interfaces between two fluids imposes a strict constraint on the numerical time-step applied to solve the equations governing this problem and is directly associated with the stability of interfacial flow ...
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Compressive VOF method with skewness correction to capture sharp interfaces on arbitrary meshes
- Fabian Denner
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
  ,
- Berend G.M. van Wachem
  Thermofluids Division, Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
Journal of Computational Physics, Volume 279, Issue C•December 2014, pp 127-144 • https://doi.org/10.1016/j.jcp.2014.09.002

The accurate and efficient modelling of two-phase flows is at present mostly limited to structured, unskewed meshes, due to the additional topological and numerical complexity of arbitrary, unstructured meshes. Compressive VOF methods which discretize ...
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Derivation and validation of a novel implicit second-order accurate immersed boundary method
- Andreas Mark
  Chalmers University of Technology, Department of Applied Mechanics, 412 96 Gothenburg, Sweden
  ,
- Berend G. M. van Wachem
  Chalmers University of Technology, Department of Applied Mechanics, 412 96 Gothenburg, Sweden
Journal of Computational Physics, Volume 227, Issue 13•June, 2008, pp 6660-6680 • https://doi.org/10.1016/j.jcp.2008.03.031

A novel implicit second-order accurate immersed boundary method (IBM) for simulating the flow around arbitrary stationary bodies is developed, implemented and validated in this paper. The IBM is used to efficiently take into account the existence of ...
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Simulation of Fluidized Beds with Lattice Gas Cellular Automata
- B.G.M. van Wachem
  Chemical Reactor Engineering Section, Department of Chemical Process Technology, Delft University of Technology, The Netherlands
  ,
- A.F. Bakker
  Chemical Reactor Engineering Section, Department of Chemical Process Technology, Delft University of Technology, The Netherlands
  ,
- J.C. Schouten
  Chemical Reactor Engineering Section, Department of Chemical Process Technology, Delft University of Technology, The Netherlands
  ,
- M.W. Heemels
  Chemical Reactor Engineering Section, Department of Chemical Process Technology, Delft University of Technology, The Netherlands
  ,
- S.W. de Leeuw
  Chemical Reactor Engineering Section, Department of Chemical Process Technology, Delft University of Technology, The Netherlands
Journal of Computational Physics, Volume 135, Issue 1•July 15, 1997, pp 1-7 • https://doi.org/10.1006/jcph.1997.5719

This paper introduces an approach for the simulation of the hydrodynamic behaviour of gas solid fluidized beds via the use of lattice gas cellular automata. This approach is based on a two-speed model, developed by U. Frisch, B. Hasslacher, and Y. ...
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A. No. An author does not need to subscribe to the ACM Digital Library nor even be a member of ACM.

Q. What are the requirements to use this service?
A. To access ACM Author-Izer, authors need to have a free ACM web account, must have an ACM Author Profile page in the Digital Library, and must take ownership of their Author Profile page.

Q. What is an ACM Author Profile Page?
A. The Author Profile Page initially collects all the professional information known about authors from the publications record as known by the ACM Digital Library. The Author Profile Page supplies a quick snapshot of an author's contribution to the field and some rudimentary measures of influence upon it. Over time, the contents of the Author Profile page may expand at the direction of the community. Please visit the ACM Author Profile documentation page for more background information on these pages.

Q. How do I find my Author Profile page and take ownership?
A. You will need to take the following steps:
- Create a free ACM Web Account
- Sign-In to the ACM Digital Library
- Find your Author Profile Page by searching the ACM Digital Library for your name
- Find the result you authored (where your author name is a clickable link)
- Click on your name to go to the Author Profile Page
- Click the "Add Personal Information" link on the Author Profile Page
- Wait for ACM review and approval; generally less than 24 hours

Q. Why does my photo not appear?
A. Make sure that the image you submit is in .jpg or .gif format and that the file name does not contain special characters

Q. What if I cannot find the Add Personal Information function on my author page?
A. The ACM account linked to your profile page is different than the one you are logged into. Please logout and login to the account associated with your Author Profile Page.

Q. What happens if an author changes the location of his bibliography or moves to a new institution?
A. Should authors change institutions or sites, they can utilize ACM Author-Izer to disable old links and re-authorize new links for free downloads from a new location.

Q. What happens if an author provides a URL that redirects to the author’s personal bibliography page?
A. The service will not provide a free download from the ACM Digital Library. Instead the person who uses that link will simply go to the Citation Page for that article in the ACM Digital Library where the article may be accessed under the usual subscription rules.

However, if the author provides the target page URL, any link that redirects to that target page will enable a free download from the Service.

Q. What happens if the author’s bibliography lives on a page with several aliases?
A. Only one alias will work, whichever one is registered as the page containing the author’s bibliography. ACM has no technical solution to this problem at this time.

Q. Why should authors use ACM Author-Izer?
A. ACM Author-Izer lets visitors to authors’ personal home pages download articles for no charge from the ACM Digital Library. It allows authors to dynamically display real-time download and citation statistics for each “authorized” article on their personal site.

Q. Does ACM Author-Izer provide benefits for authors?
A. Downloads of definitive articles via Author-Izer links on the authors’ personal web page are captured in official ACM statistics to more accurately reflect usage and impact measurements.

Authors who do not use ACM Author-Izer links will not have downloads from their local, personal bibliographies counted. They do, however, retain the existing right to post author-prepared preprint versions on their home pages or institutional repositories with DOI pointers to the definitive version permanently maintained in the ACM Digital Library.

Q. How does ACM Author-Izer benefit the computing community?
A. ACM Author-Izer expands the visibility and dissemination of the definitive version of ACM articles. It is based on ACM’s strong belief that the computing community should have the widest possible access to the definitive versions of scholarly literature. By linking authors’ personal bibliography with the ACM Digital Library, user confusion over article versioning should be reduced over time.

In making ACM Author-Izer a free service to both authors and visitors to their websites, ACM is emphasizing its continuing commitment to the interests of its authors and to the computing community in ways that are consistent with its existing subscription-based access model.

Q. How do authors access ACM Author-Izer?
A. See How to Use

Q. Why can’t I find my most recent publication in my ACM Author Profile Page?
A. There is a time delay between publication and the process which associates that publication with an Author Profile Page. Right now, that process usually takes 4-8 weeks.

Q. How does ACM Author-Izer expand ACM’s “Green Path” Access Policies?
A. ACM Author-Izer extends the rights and permissions that authors retain even after copyright transfer to ACM, which has been among the “greenest” publishers. ACM enables its author community to retain a wide range of rights related to copyright and reuse of materials. They include:
- Posting rights that ensure free access to their work outside the ACM Digital Library and print publications
- Rights to reuse any portion of their work in new works that they may create
- Copyright to artistic images in ACM’s graphics-oriented publications that authors may want to exploit in commercial contexts
- All patent rights, which remain with the original owner

Berend G M van Wachem