Alexander Jaust

Simulation of interface-coupled porous-medium applications using partitioned methods

Wed, 03 Aug 2022 10:00:00 +0100

Simulation of multi-physics porous-media applications using partitioned black-box methods

Thu, 09 Jun 2022 11:20:00 +0100

Simulation of interface-coupled porous-medium applications using partitioned coupling methods

Thu, 02 Jun 2022 11:45:00 +0200

Simulation of flow in deformable fractures

Tue, 22 Feb 2022 10:00:00 +0100

Simulation of flow in deformable fractures using a quasi-Newton based partitioned coupling approach

Wed, 19 Jan 2022 00:00:00 +0000

Preprint is available on arxiv

Coupling Free and Porous-Media Flow via Partitioned Black-Box Methods

Mon, 21 Jun 2021 16:25:00 +0200

Simulation of fractured porous media using partitioned black-box methods

Tue, 01 Jun 2021 15:25:00 +0200

FEniCS-preCICE: Coupling FEniCS to other Simulation Software

Mon, 01 Mar 2021 00:00:00 +0000

Solving coupled free and porous-media flow with preCICE and DuMuX

Tue, 23 Feb 2021 11:00:00 +0100

We present recent results of coupling free and porous‐media flow applications and the development of the corresponding adapter. The main focus is on simulations based on DuMuX ( https://dumux.org/ ) which is an open‐source framework for solving flow problems, especially porous‐media flow. We present results using the partitioned approach of preCICE for different scenarios and compare it, where applicable, with monolithic simulations or exact solutions.

Partitioned black-box coupling for porous-media applications

Mon, 11 Jan 2021 08:00:00 +0100

Many real-world applications problems involve flow in porous media and some other medium that can be separated into subdomains by a sharp interface. An example is the flow of water (free flow) over a river bed (porous-medium flow). Modeling such an application involves different mathematical models in each of the subdomains and, thus, leads to ill-conditioned systems of equations when solved monolithically. Due to the ill-conditioning of the matrix, in the monolithic approach one has to use direct linear solvers or has to develop specialized preconditioners [1]. Additionally, the monolithic approach can be restrictive with respect to time and memory requirements and it prevents the reuse of already implemented solvers that are highly specialized for one of the problems. Partitioned methods that solve the coupled problem based on the ideas of domain decomposition techniques are a good alternative. These methods have been especially popular for finite-element discretizations of porous media problems [3]. We use partitioned coupling methods to couple free and porous-media flow via a “black-box” approach that has been especially popular in the field of fluid-structure interaction. The coupling does not make any assumptions on the discretization in any of the domains. The partitioned coupling is realized via the open-source coupling library preCICE [2]. We identify suitable coupling variants and numerically investigate the behavior of the coupling schemes. In addition, the influence of the partitioned coupling on the numerical solution is examined.

References

[1] M. Benzi, G. H. Golub, and J. Liesen. “Numerical solution of saddle point problems”. In: Acta numerica 14 (2005), pp. 1–137.

[2] H.-J. Bungartz, F. Lindner, B. Gatzhammer, M. Mehl, K. Scheufele, A. Shukaev, and B. Uekermann. “preCICE – A fully parallel library for multi-physics surface coupling”. In: Computers and Fluids 141 (2016). Advances in Fluid-Structure Interaction, pp. 250–258.

[3] M. Discacciati and A. Quarteroni. “Navier-Stokes/Darcy coupling: Modeling, analysis, and numerical approximation”. In: Revista Matemática Complutense 22.2 (2009).

Poster: Partitioned coupling schemes for free-flow and porous-media applications with sharp interfaces

Tue, 16 Jun 2020 15:30:00 +0200

This poster is presented at the “Finite Volumes for Complex Applications IX” conference to be held online. It comes with a conference proceeding.

Partitioned coupling schemes for free-flow and porous-media applications with sharp interfaces

Tue, 09 Jun 2020 17:47:10 +0000

Poster: Parallel numerical coupling methods for interface problems

Mon, 09 Mar 2020 00:00:00 +0100

I present the current results of project area D02 of the collaborative research center 1313.

Coupling fluid flows with DuMuX

Mon, 17 Feb 2020 16:30:00 +0100

Many porous media applications involve multiphysics systems that can be separated by a sharp interface, for example coupling porous-media flow and free flow. The solver DuMuX (DUNE for Multi-{Phase, Component, Scale, Physics, …} [1]) is a C++-based open-source software that is used extensively for solving flow and transport processes in porous media.

This talk will focus on a new preCICE adapter that allows to couple DuMuX with DuMuX or other solvers aiming to be applicable to a wide variety of porous media applications. In the talk we discuss the development, the adapter’s current capabilities, and we give a short overview on how to use the adapter, especially in the context of coupling porous-media flow and free flow. We will conclude with the discussion of future plans and possible extensions of the adapter.

[1] https://dumux.org/

Umgang mit Forschungssoftware an der Universität Stuttgart

Wed, 01 Jan 2020 00:00:00 +0000

Coupling porous media and free flow Simulation using the multi-purpose coupling library preCICE

Wed, 31 Jul 2019 17:10:00 +0100

Using preCICE for coupled problems within the SFB1313 - Current status

Mon, 20 May 2019 00:00:00 +0100

preCICE - a Comprehensive Coupling Library for Large-scale Surface-coupled Multi-physics Problems

Mon, 11 Mar 2019 15:55:00 +0100

Using preCICE for coupled problems within the SFB1313

Thu, 14 Feb 2019 00:00:00 +0100

preCICE - A coupling library for partitioned multi-physics simulations

Mon, 07 Jan 2019 10:00:00 +0100

Imprint

Thu, 28 Jun 2018 00:00:00 +0100

Imprint

Thu, 28 Jun 2018 00:00:00 +0100

Poster: A hybridized DG method for unsteady flow problems

Tue, 22 May 2018 00:00:00 +0100

The poster was presented by J. Schütz.

High-order flow simulations on ThinKing

Wed, 18 Apr 2018 16:30:00 +0100

FESTUNG: A MATLAB / GNU Octave toolbox for the discontinuous Galerkin method. Part III: Hybridized discontinuous Galerkin (HDG) formulation

Mon, 01 Jan 2018 00:00:00 +0000

General linear methods for time-dependent PDEs

Mon, 01 Jan 2018 00:00:00 +0000

Novel implicit unconditionally stable time-stepping for DG-type methods and related topics

Mon, 01 Jan 2018 00:00:00 +0000

Implicit Multiderivative Collocation Solvers for Linear Partial Differential Equations with Discontinuous Galerkin Spatial Discretizations

Fri, 01 Dec 2017 00:00:00 +0000

Multiderivative time integrators for a hybridized discontinuous Galerkin method

Mon, 18 Sep 2017 11:30:00 +0100

Poster: A hybridized discontinuous Galerkin method for unsteady flow problems - A versatile method for a wide range of problems in fluid dynamics?

Mon, 26 Jun 2017 00:00:00 +0100

Poster: A hybridized DG method for unsteady flow problems - Towards an efficient method for a wide range of flow problems

Wed, 14 Jun 2017 00:00:00 +0100

Poster: A hybridized DG method for unsteady flow problems - An efficient method for a huge range of flows

Fri, 02 Jun 2017 00:00:00 +0100

Multiderivative time-integrators for the hybridized discontinuous Galerkin method

Mon, 26 Sep 2016 00:00:00 +0100

An evaluation of shock-capturing schemes for hybridized discontinuous Galerkin methods

Wed, 03 Aug 2016 14:30:00 +0100

An efficient linear solver for the hybridized discontinuous Galerkin method

Wed, 09 Mar 2016 14:30:00 +0100

An efficient linear solver for the hybridized discontinuous Galerkin method

Fri, 01 Jan 2016 00:00:00 +0000

Implicit multistage two-derivative discontinuous Galerkin schemes for viscous conservation laws

Fri, 01 Jan 2016 00:00:00 +0000

Efficient time integration for the HDG method

Fri, 25 Sep 2015 14:30:00 +0100

I replaced J. Schütz.

Multiderivative time-integrators for the hybridized discontinuous Galerkin method

Tue, 21 Jul 2015 11:10:00 +0100

Modeling of Transport and Mixing Phenomena in Turbulent Flows in Closed Domains

Wed, 01 Apr 2015 00:00:00 +0000

An HDG Method for Unsteady Compressible Flows

Thu, 01 Jan 2015 00:00:00 +0000

Multiderivative time-integrators for the hybridized discontinuous Galerkin method

Thu, 01 Jan 2015 00:00:00 +0000

A hybridized DG method for unsteady compressible flows

Mon, 15 Sep 2014 00:00:00 +0100

An HDG method for unsteady compressible flows

Mon, 23 Jun 2014 00:00:00 +0100

A hybridized discontinuous Galerkin method for unsteady flows with shock-capturing

Wed, 18 Jun 2014 14:30:00 +0100

A Hybridized discontinuous Galerkin Method for Unsteady Flows with Shock-Capturing

Wed, 01 Jan 2014 00:00:00 +0000

A temporally adaptive hybridized discontinuous Galerkin method for time-dependent compressible flows

Wed, 01 Jan 2014 00:00:00 +0000

A Hybridized Discontinuous Galerkin Method for Time-Dependent Compressible Flows

Tue, 01 Jan 2013 00:00:00 +0000

Teaching

Mon, 01 Jan 0001 00:00:00 +0000

Current/upcoming semester

I am not teaching at the moment.

Teaching at University of Stuttgart

Summer term 2022

Lecturer of one part of the “Data-Integrated Simulation Science B” module (25% of the course)
Co-organizer and advisor in seminar “SimTech seminar”

Winter term 2021/22

Lecturer of course “Simulation Software Engineering”
- This is a new course developed together with Benjamin Uekermann and Ishaan Desai

Summer term 2021

Lecturer of course “Basic Principles of Modeling and Simulation”
Organizer of seminar “Die bunte Welt der Simulation”
Co-organizer and advisor in seminar “SimTech seminar”

Summer term 2020

Lecturer of course “Parallel Numerics”
Advisor in seminar “Simulation of Large Systems”
Co-organizer and advisor in seminar “SimTech seminar”

Winter term 2019/20

Teaching assistant for “Numerische Simulation” (engl. “Numerical simulation”)
Advisor in seminar “Machine learning in Numerical Simulation”

Summer term 2019

Lecturer of one part of the “Simulation Technology Master Module B” module (25% of the course)
Advisor in seminar “Simulation of Large Systems”

Teaching at RWTH Aachen University

Summer term 2016

Advisor in seminar “CES Seminar”

Winter term 2015/16

Teaching assistant for “Mathematics I (CES)”

Winter term 2014/15

Teaching assistant for “Mathematics I (CES)”
Advisor in seminar “CES Seminar”

Summer 2014

Teaching assistant for “Mathematics IV (CES)”