GAMM2025

Session

S07: Coupled problems

S07

8 Apr 2025, 08:30

Lecture and Conference Centre

Conveners

S07: Coupled problems: S07.01

• Yousef Heider
• Arnd Wagner

S07: Coupled problems: S07.02

• Yousef Heider
• Arnd Wagner

S07: Coupled problems: S07.03

• Arnd Wagner
• Stephan Wulfinghoff

S07: Coupled problems: S07.04

• Detlef Kuhl
• Abedulgader Baktheer

S07: Coupled problems: S07.05

• Fadi Aldakheel
• Yousef Heider

S07: Coupled problems: S07.06

• Andreas Ricoeur

Description

Coupled problems arise in several applications. From a general point of view each problem containing more than one primary field is called a coupled one. Usually the class of coupled problems is subdivided into volumetrically coupled problems and problems with surface coupling. The class of volumetrically coupled problems contains e.g. the fluid flow in porous solids described by mixture theory, thermo-mechanically coupled problems, chemo-mechanically coupled problems and electro- or magneto-mechanically coupled problems while in the second class problems like the fluid-solid interaction via an interface are included. All problems is in common that the presence of different fields in the numerical treatment requires special attention with respect to the multi-field formulation and the solution strategy. The session on coupled problems deals with all aspects mentioned above, i.e. ranging from modelling aspects to numerical solution strategies.

178. Steady vibration problems in the theory of Moore-Gibson-Thompson thermoelasticity for materials with voids

Merab Svanadze

08/04/2025, 08:30

In this talk, the linear model of Moore-Gibson-Thompson (MGT) thermoelasticity for materials with voids is introduced in which the coupled phenomenon of the deformation of material, the concepts of volume fraction of pore network and the MGT law of heat conduction is presented. The basic boundary value problems (BVP) of steady vibrations of this model are investigated. Indeed, the fundamental...

179. Modelling and simulation of experiments for fractured and fracturing porous media

Arndt Wagner

08/04/2025, 08:50

Fractured and fracturing porous media are commonly encountered in a wide range of scientific and engineering disciplines such as geomechanics and environmental applications. Understanding the complex coupled behaviour between fractures, fluid flow and mechanical deformation in porous materials is crucial to better evaluate applications such as geothermal energy production.

Experimental...

180. Modelling of resuspension and sedimentation of solid particles in fractured and fracturing porous media using a TPM-phase-field approach with mass production terms

Yann Rivas

08/04/2025, 09:10

In models describing hydraulic fracturing problems by use of the Theory of Porous Media (TPM) with an integrated phase-field approach, see e. g. [1-3], fracturing scenarios such as natural fracturing and classical hydraulic fracturing processes can be reliably described. However, state-of-the-art models do not capture a local porosity change, as the fractured rock or soil particles remain in...

181. Coupling phase-field fracture with non-isothermal fluid-structure interaction problems

Henry von Wahl

08/04/2025, 09:30

We consider the coupled, multi-domain, multi-physics problem posed by a fluid-filled, pressurised fracture in an intact solid medium surrounding the fluid. For example, such a setting may be found in Enhanced Geothermal Systems or nuclear waste management.

A well-established method for dealing with cracks is the phase-field fracture (PFF) approach. This method is effective as it can deal...

182. A phase field model to describe the behavior of volcanic crystals

Hendrik Holger Haddenhorst

08/04/2025, 09:50

Diffusion chronometry is an important tool in understanding various aspects of geological processes, e.g., processes in magma reservoirs [1]. However, the timescales which can be accessed by diffusion chronometry are restricted by recrystallization. While the coupling of mechanical and chemical processes has not been explored in a quantitative framework yet, it has been shown in both...

183. Modeling of hydrogen-embrittlement using a monolithically coupled, nonlocal Gurson-Tvergaard-Needleman damage model

Stefan Prüger

08/04/2025, 10:10

The presence of hydrogen in steels leads to a significant loss of ductility, giving rise to a ductile to brittle transition with increasing hydrogen concentration, which is a major concern in the safety assessment of structural components. Among other effects, the hydrogen-enhanced decohesion (HEDE) and the hydrogen-enhanced localized plasticity (HELP) mechanisms are primarily associated with...

184. Smoothed Particle Hydrodynamics as a Tool for Improving Deep-Hole Drilling

Andreas Baumann

08/04/2025, 16:30

Deep-Hole drilling is applied for machining holes with a length-to-diameter ratio larger than ten. The applications are in the automotive, aerospace, and medical industries, and machine fabrication for the food industry. Different deep-hole drilling methods are available, ranging to diameters less than one millimeter. All methods are characterized by the high-quality hole and the high level of...

185. An approach to model the influence of hydrodynamics on wet grinding

Paul Thunich

08/04/2025, 16:50

In grinding processes, process parameters are currently set based on experience or empirical trial-and-error tests since little knowledge about basic interactions between process parameters exists, and contrary influences must be balanced. Especially when developing new cutting fluids, a conflict between cooling effects and hydrodynamic load-bearing effects arises. To resolve this conflict, a...

186. Periodic self-propulsion of a swimmer

Joris Edelmann

08/04/2025, 17:10

A body immersed in a fluid (swimmer) can move by deformation or by shifting its centre of mass. We assume that both actions are periodic and that the force acting on the body is zero. For simplicity, we assume that the problem has cylindrical symmetry.

Considering a linear fluid-solid model, the body will exhibit oscillatory motion, but with a zero mean velocity. This changes when...

187. Seamless Simulation Across Regimes – Uniformly Stable DG Discretization for Coupled Stokes-Darcy Flow

Julia Kowalski

08/04/2025, 17:30

Many applications in engineering and the applied sciences require coupling free incompressible flow with porous media flow. Such multi-physics coupling can be achieved via a split-domain approach, in which numerical techniques are tailored to free flow and porous media flow in the respective domains. This, however, introduces the problem of tracking the interface between subdomains on which...

188. Coupled CFD-DEM numerical analysis of reactive flow in a porous zone

Izabela Wardach-Święcicka

08/04/2025, 17:50

In today’s era, most nations worldwide are undertaking endeavors to enhance the exploration of locally available energy sources, to attain independence from external supplies. The production of alternative fuels from biomass and waste through thermal treatment or their direct utilization in the combustion process remains a predominant method for expeditious and cost-effective heat generation....

189. Space-Time Block-structured Meshing in Coupled Problems with Moving Domains

Teresa Schwentner

08/04/2025, 18:10

Coupled problems often include simulations on moving domains, where objects fully rotate or undergo large displacements, hence an update of the mesh is required. This mesh update is a crucial and notoriously difficult task. Different methods have been proposed, such as [1, 2], each coming with its own limitations. The proposed approach is based on a block-structured meshing scheme. Generally,...

190. Identification of Ferroelectric Energy Harvesting Cycles: from Material Modeling to Process Optimization

Andreas Warkentin

09/04/2025, 08:30

Ferroelectrics exhibit many interesting effects, both linear and nonlinear, which is why these materials are widely used in science and industry. Recently, the nonlinear effects have also been employed in the field of energy harvesting [1,2,3], while for a long time only linear effects were exploited. Moreover, nonlinear effects are irreversible and are accompanied by energy dissipation, which...

191. Multiscale modeling of structured magnetorheological elastomers using physics-augmented neural networks

Heinrich Roth

09/04/2025, 08:50

Structured magnetorheological elastomers (MREs) are composite materials which show magneto-mechanical coupling effects. They consist of magnetizable particles arranged in a chain-like pattern, embedded in a soft elastomer matrix. Explicitly resolving the microstructure of real-world samples is infeasible, necessitating the adoption of a multiscale modeling approach. In this work we introduce a...

192. Numerical modeling of the thermo-mechanical and electrical behavior of a sensor-integrating jaw coupling

Johannes D.M. Menning

09/04/2025, 09:10

ndustry 4.0 requires more and more data from the production process, e.g., on transmitted forces, torques and wear, in order to reduce expensive downtimes and to increase productivity. Direct or indirect methods can be used to collect this data. Indirect methods include, for example, determining the transmitted torque of a coupling by measuring the motor current. For direct measurement, the...

193. Energy, Momentum and Entropy Consistent Integrators for Discrete Coupled Systems Using GENERIC

Pit Reiff

09/04/2025, 09:30

The consistent numerical analysis of balance laws in multiphysical systems demands specialized time integration methods. These methods must respect the system’s invariants, as outlined by Noether’s theorem while adhering to key thermodynamic principles: conservation of linear and angular momentum, energy conservation, and positive dissipation. The GENERIC(General Equation for Non-Equilibrium...

194. Space-Time Discretization of Nonlinear Coupled Thermo-Elastodynamical Problems in a Novel, Polyconvexity-Inspired, Mixed GENERIC Framework

Moritz Hille

09/04/2025, 09:50

We propose a unifying approach combining a mixed polyconvexity-inspired framework with the thermodynamically consistent GENERIC (General Equation for Non-Equilibrium Reversible Irreversible Coupling) formulation to simulate coupled nonlinear thermo-elastodynamic problems while preserving specific structural properties, depending on the chosen thermodynamic variable.GENERIC provides a...

195. Anisotropic friction models of moving macromolecules in polymeric liquids

Alfred Zmitrowicz

09/04/2025, 16:30

Macromolecules in polymeric liquids (polymer melts, solutions, foams and gels, polymer liquid crystals) are usually distributed randomly, but under large external loads, deformations and high temperatures they can change shapes and orientations. The oriented macromolecules can move with a high degree of friction anisotropy. How to determine anisotropic friction forces and moments acting on the...

196. Modeling concepts for piezoceramics in ultrasonic motors

Felix Sutter

09/04/2025, 16:50

The successful development of ultrasonic drives, e.g. for high-precision positioning, requires a thorough understanding of the material behavior of the piezoceramics utilized. In particular, the material behavior during dynamic high-power operation at high resonance frequencies and large vibration amplitudes plays a decisive role. The microstructure experiences high loading rates at high...

197. Variational thermomechanically coupled SMA material model and optimization of SMA based out-of-plane bistable microactuator

Muhammad Babar Shamim

09/04/2025, 17:10

This work demonstrates a fully thermomechanically coupled material model for shape memory alloys (SMAs) that accurately predict key behaviors that occur in SMA, such as the shape memory effect, superelasticity, stress and strain recovery, and martensite reorientation. Developed within the generalized standard material (GSM) framework, the model is derived from a rate potential, with its...

198. Multiphase-field simulation studies on Ni thin film dewetting

Nils Becker

09/04/2025, 17:30

We present a multi-phase field model to study break-up and droplet formation in thin metal films. This model represents individual metal grains as distinct phase-field variables and captures the effects of coarsening and surface diffusion [1]. By coupling the phase-field model to a chemical potential field through the grand potential formulation, we develop a robust framework for simulating...

199. Simulating cycled loading of hydrogen on thin metallic structures

Johannes Gisy

09/04/2025, 17:50

Thin metal films exposed to a hydrogen atmosphere are experimentally studied as a hydrogen uptake results in compressive stresses [2]. Compressive stresses are critical for hydride formation. Depending on the atmospheric state, a release of hydrogen can counteract the thermodynamic driving force of hydride formation. However, the thermomechanical state is path-dependent due to the plastic...

200. A laser beam welding process and its microstructural thermoelastoplastic analysis

Philipp Hartwig

09/04/2025, 18:10

Laser beam welding has emerged as an advanced, contactless joining technique. This is primarily due to its high feed rates and low thermal distortion compared to conventional welding processes, [1]. These advantages stem from the focused energy input, enabling precise and controlled execution. Additionally, the automation potential of laser beam welding broadens its applicability across...

201. Porous media approach for multi-physics modeling of Nafion membrane in water electrolysis

Fadi Aldakheel

10/04/2025, 08:30

The climate crisis represents one of the most pressing and intricate challenges humanity faces in the modern era. The effects of rising global temperatures are already evident and cannot be ignored. There is widespread agreement that the most effective approach to mitigating global warming and its consequences is a significant and immediate reduction in greenhouse gas emissions worldwide. In...

202. Multi-scale modeling of electro-chemo-mechanical interactions in battery electrode composites

Ralf Jänicke

10/04/2025, 09:10

The Structural Battery represents an innovative carbon fiber-reinforced polymer composite, designed to serve a dual purpose: As a storage device for electrical energy (viz. as a battery) and as a robust support for mechanical loads. Carbon fibers play a multifaceted role, acting as an active electrode material, current collector, and mechanical reinforcement. These fibers are integrated into a...

203. A phase-field model for the anodic dissolution process during electrochemical machining

Annika Schmidt

10/04/2025, 09:30

Electrochemical machining (ECM) is a non-conventional machining process which allows the contactless manufacturing of high-strength and hard to machine polycrystalline materials without inducing residual stresses or thermo-mechanical surface changes in the workpiece [1]. Furthermore, since the ECM technology allows high productivity rates, it is used to machine high-precision components in the...

204. A thermodynamically consistent phase field model for organic solar cell production

Carmen Tretmans

10/04/2025, 09:50

In this talk, we discuss the morphology formation within the active layer of organic solar cells. The active layer consists of regions of pure electron donor and acceptor and is formed during the drying of a thin film. This process is based on a spinodal decomposition of the donor and acceptor in a solvent, where the solvent is allowed to evaporate. The obtained model couples the phase...

205. Two scale FE-FFT based modeling of cancellous bone

Mischa Blaszczyk

10/04/2025, 10:10

Osteoporosis is the most common bone disease worldwide. The disease is characterized by a loss in bone density, which reduces the bone stiffness over time and thus increases the likelihood of fractures. In past contributions (e.g., [1-3]), we introduced a multiscale material model of cancellous bone considering mechanical, electric and magnetic effects. An important application of this model...

206. Implementation of a thermomechanical model for journal bearings using p-FEM

Fabian Schmidtchen

10/04/2025, 14:00

Hydrodynamic journal bearings are essential machine parts that are used in particular for applications with high rotational speeds. Their precise simulation requires the consideration of thermomechanical interactions between solids and fluid. During operation, the shear-stresses in the fluid with lubricant film heights in the range of 5 to 100 µm, lead to significant friction losses acting as...

207. Physics-based modeling of a counter-flow heat exchanger with application to control model development

Marten Klein

10/04/2025, 14:20

District heating grids (DHGs) are considered a key technology for decarbonizing the heating sector. In a DHG, heat energy is transported from heat sources to heat sinks through a network of pipes. Heat sources and heat sinks are connected to the district heating network usually via counter-flow heat exchangers so that they are hydraulically separated but thermally coupled. Therefore, a precise...

208. Thermal Analysis of Heat Sink with Different Channel Geometries

Weltej Iticha

10/04/2025, 14:40

The heat sink (HS) is a heat exchanger that transfers the heat generated by an electronic or mechanical device to a fluid medium. It prevents damage to electronic equipment by continuously dissipating heat, enabling their sustained advancement and widespread use in applications [1]. In the last decades, researchers pursued different approaches to improve the performance of HS. Ghadhban and...

700. Plastic strain induced phenomena at temperatures close to absolute zero

Błażej Skoczeń

10/04/2025, 15:00

Metastable alloys, like stainless steels, applied in the proximity of absolute zero, undergo at extremely low temperatures three coupled dissipative phenomena: intermittent plastic flow (IPF), plastic strain-induced phase transformation as well as evolution of micro-damage, including radiation-induced damage. IPF is characteristic of low (LSFE) and high stacking fault energy (HSFE) materials...