IV International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED 2011) Kos, Greece, 20-22 June, 2011http://hdl.handle.net/2117/1907942024-11-09T23:42:26Z2024-11-09T23:42:26ZThermoelastic stress analysis for a tuve under general mechanochemical corrosión conditionsPronina, Yulia G.http://hdl.handle.net/2117/3282362020-08-29T02:48:04Z2020-08-27T10:35:20ZThermoelastic stress analysis for a tuve under general mechanochemical corrosión conditions
Pronina, Yulia G.
This work deals with the uniform surface mechanochemical corrosion of an elastic thick-walled long cylindrical tube subjected to internal and externa! pressure of environments at different temperatures. The rate of uniform corrosion is supposed to be linear with the stress and inversely as the exponent of time. The problem is then reduced to the first-order ordinary differential equation in a tube cross-sectional size. Analytical solutions of this equation are found. To determine the tube lifetime and the cause of its failure, the method based on various estimating functions is proposed. The algorithm for environmental contamination by corroded material is developed.
2020-08-27T10:35:20ZPronina, Yulia G.This work deals with the uniform surface mechanochemical corrosion of an elastic thick-walled long cylindrical tube subjected to internal and externa! pressure of environments at different temperatures. The rate of uniform corrosion is supposed to be linear with the stress and inversely as the exponent of time. The problem is then reduced to the first-order ordinary differential equation in a tube cross-sectional size. Analytical solutions of this equation are found. To determine the tube lifetime and the cause of its failure, the method based on various estimating functions is proposed. The algorithm for environmental contamination by corroded material is developed.Coupled reactive transport modeling - the program transportZabka, VratislavSembera, Janhttp://hdl.handle.net/2117/3282352020-08-29T02:47:59Z2020-08-27T10:28:18ZCoupled reactive transport modeling - the program transport
Zabka, Vratislav; Sembera, Jan
The contribution presents the program Transport, which serves to
simulation of column transport experiments. Its main function is not to predict results
of experiments but to compare influence of individual physical and chemical processes
to the experiment results.
The one-dimensional advection-diffusion model is based on Finite Volume Method;
it includes the triple porosity concept, sorption, retardation, and chemical reactions
simulated using connected program React from The Geochemist‘s Workbench package
or PhreeqC. Due to these geochemical programs, the user has extensive possibilities
of chemistry simulation during transport. The program Transport simulates not only
the processes inside the column but also preparation of entering solutions and
measurement methods of outgoing solution parameters.
Important part of the contribution would be demonstration of results of simulation
of real transport column experiments recently realized at the Technical University of Liberec.
2020-08-27T10:28:18ZZabka, VratislavSembera, JanThe contribution presents the program Transport, which serves to
simulation of column transport experiments. Its main function is not to predict results
of experiments but to compare influence of individual physical and chemical processes
to the experiment results.
The one-dimensional advection-diffusion model is based on Finite Volume Method;
it includes the triple porosity concept, sorption, retardation, and chemical reactions
simulated using connected program React from The Geochemist‘s Workbench package
or PhreeqC. Due to these geochemical programs, the user has extensive possibilities
of chemistry simulation during transport. The program Transport simulates not only
the processes inside the column but also preparation of entering solutions and
measurement methods of outgoing solution parameters.
Important part of the contribution would be demonstration of results of simulation
of real transport column experiments recently realized at the Technical University of Liberec.Three domain thermal and mechanical fluid-structrure interaction analysis applied to cooled rocket thrust chambersKowollick, Daniel S.Haupt, Matthias C.Horst, Peterhttp://hdl.handle.net/2117/3282342020-08-29T02:47:51Z2020-08-27T10:23:48ZThree domain thermal and mechanical fluid-structrure interaction analysis applied to cooled rocket thrust chambers
Kowollick, Daniel S.; Haupt, Matthias C.; Horst, Peter
Regeneratively cooled combustion chamber and nozzle structures are exposed
to extreme temperature gradients in space and time. One sided wall heating during the
hot run generates thermomechanical loads that induce high heat fluxes on the surface
and consequently high stresses inside the thin cooling channel structures. In order to
address the strong interaction between the structure and the different flow fields a coupled
simulation considering the thermal and mechanical interactions is desirable. The present
study covers both physical couplings in a partitioned approach applied to the steady state
case of a subscale thrust chamber.
Furthermore, this study will present a novel full parametric 3D modelling approach
for cooled rocket thrust chambers, which is specifically designed to reduce computational
expense in FSI analyses by applying non conforming symmetry conditions across coupling
interfaces. The parametrization ranges from thrust chamber contour design through CAD
modelling up to grid generation of the individual domains. Further extension of the
parametric approach allows the analysis of thermal protection systems applied inside the
combustion chamber.
2020-08-27T10:23:48ZKowollick, Daniel S.Haupt, Matthias C.Horst, PeterRegeneratively cooled combustion chamber and nozzle structures are exposed
to extreme temperature gradients in space and time. One sided wall heating during the
hot run generates thermomechanical loads that induce high heat fluxes on the surface
and consequently high stresses inside the thin cooling channel structures. In order to
address the strong interaction between the structure and the different flow fields a coupled
simulation considering the thermal and mechanical interactions is desirable. The present
study covers both physical couplings in a partitioned approach applied to the steady state
case of a subscale thrust chamber.
Furthermore, this study will present a novel full parametric 3D modelling approach
for cooled rocket thrust chambers, which is specifically designed to reduce computational
expense in FSI analyses by applying non conforming symmetry conditions across coupling
interfaces. The parametrization ranges from thrust chamber contour design through CAD
modelling up to grid generation of the individual domains. Further extension of the
parametric approach allows the analysis of thermal protection systems applied inside the
combustion chamber.Process modelling of linear friction welding (LFW) between AA2124/SICp composite and unreinforced alloySong, X.Baimpas, N.Harding, S.Korsunsky, A.M.http://hdl.handle.net/2117/3282332020-08-29T02:47:54Z2020-08-27T10:19:47ZProcess modelling of linear friction welding (LFW) between AA2124/SICp composite and unreinforced alloy
Song, X.; Baimpas, N.; Harding, S.; Korsunsky, A.M.
In the present study, the Linear Friction Welding (LFW) process between a bar of
Metal Matrix Composite (MMC) AMC225xe (AA2124 with 25% SiC particulate
reinforcement) and a bar of unreinforced base alloy was simulated using the commercial finite
element package ABAQUSTM. Fully coupled implicit thermo-mechanical analysis procedure
was employed, with semi-automatic re-meshing using Python scripting and output database
scripting methods for extracting deformed configurations. Due to the large deformation near
the weld region, multiple analyses were carried out between each re-meshing stage in order to
limit the element distortion. Comparison of the simulation results with the experimental data
collected during welding, and with post-weld optical section micrograph has shown
satisfactory agreement.
2020-08-27T10:19:47ZSong, X.Baimpas, N.Harding, S.Korsunsky, A.M.In the present study, the Linear Friction Welding (LFW) process between a bar of
Metal Matrix Composite (MMC) AMC225xe (AA2124 with 25% SiC particulate
reinforcement) and a bar of unreinforced base alloy was simulated using the commercial finite
element package ABAQUSTM. Fully coupled implicit thermo-mechanical analysis procedure
was employed, with semi-automatic re-meshing using Python scripting and output database
scripting methods for extracting deformed configurations. Due to the large deformation near
the weld region, multiple analyses were carried out between each re-meshing stage in order to
limit the element distortion. Comparison of the simulation results with the experimental data
collected during welding, and with post-weld optical section micrograph has shown
satisfactory agreement.Mass, heat and momentum transfer in natural draft wet cooling tower with flue gas dischargeKlimanek, Adam F.Bialecki, Ryszard A.http://hdl.handle.net/2117/3282322020-08-29T02:47:45Z2020-08-27T10:09:50ZMass, heat and momentum transfer in natural draft wet cooling tower with flue gas discharge
Klimanek, Adam F.; Bialecki, Ryszard A.
The paper presents CFD simulation results of a natural draught wet-coolingtower (NDWCT) with flue gas discharge. The problem considered is mixing of the fluegases with the rising plume and possible corrosion of the tower shell due to acid condensate.A previously developed CFD model of a NDWCT has been used in the analysis. Nowind conditions have been assumed and the results have shown that under this conditionthe corrosion is unlikely to occur
2020-08-27T10:09:50ZKlimanek, Adam F.Bialecki, Ryszard A.The paper presents CFD simulation results of a natural draught wet-coolingtower (NDWCT) with flue gas discharge. The problem considered is mixing of the fluegases with the rising plume and possible corrosion of the tower shell due to acid condensate.A previously developed CFD model of a NDWCT has been used in the analysis. Nowind conditions have been assumed and the results have shown that under this conditionthe corrosion is unlikely to occurEvaluation and improvement of the THM modelling capabilities for rock salt repositoriesPudewills, Alexandrahttp://hdl.handle.net/2117/3282312020-08-29T02:47:43Z2020-08-27T09:57:35ZEvaluation and improvement of the THM modelling capabilities for rock salt repositories
Pudewills, Alexandra
This paper provides a summary description of the selected results obtained in the
frame of the THERESA- project cosponsored by the European Commission (EC). The
numerical modeling of coupled thermal-hydraulic-mechanical (THM) processes with impact
on repository long-term safety was focused on simulation of a number of representative
laboratory experiments on rock salt samples. The scope of these calculations was the
validation of the actual capabilities of the constitutive model and to identify needs for further
improvements of the model. The measured development of volumetric strains and
permeability in the samples during loading process was compared posterior to calculation
results.
2020-08-27T09:57:35ZPudewills, AlexandraThis paper provides a summary description of the selected results obtained in the
frame of the THERESA- project cosponsored by the European Commission (EC). The
numerical modeling of coupled thermal-hydraulic-mechanical (THM) processes with impact
on repository long-term safety was focused on simulation of a number of representative
laboratory experiments on rock salt samples. The scope of these calculations was the
validation of the actual capabilities of the constitutive model and to identify needs for further
improvements of the model. The measured development of volumetric strains and
permeability in the samples during loading process was compared posterior to calculation
results.Coupled simulation of process-integrated powder coating by radial axial rolling of ringsKebriaei, RezaFrischkorn, JanReese, Stefaniehttp://hdl.handle.net/2117/3282302020-08-29T02:48:01Z2020-08-27T09:53:49ZCoupled simulation of process-integrated powder coating by radial axial rolling of rings
Kebriaei, Reza; Frischkorn, Jan; Reese, Stefanie
The process-integrated powder coating by radial axial rolling of rings represents
a new hybrid production technique that combines the diameter increase of ringshaped
work pieces with the application of functional outer layers [1]. The hot rolling of
the ring is strongly influenced by a coupled temperature field since the forming resistance
of the ring has to be kept under a certain level. The fact that the coating is produced
by powder metallurgy brings up another problem: In conventional ring-rolling processes
the infeed of the axial and the radial rollers in order to increase the ring’s diameter are
controlled by the assumption of volume consistency [6]. But this is not true any more
for a ring exhibiting a compressible layer. Thus attention has to be drawn to a different
coupling scheme of the roller infeed with the current shape of the ring.
The paper deals with the finite element (FE) modelling of this new process. A parameterized
2D model is used to examine the influence of several parameters on the residual
porosity in the layer. Therefore different geometric parameters are examined as well as
the influence of the roller and the ring geometry. It will be shown that the implementation
of a PID control unit is essential to ensure the roundness of the final ring shape [5]. At
the end the simulation results are illustrated.
2020-08-27T09:53:49ZKebriaei, RezaFrischkorn, JanReese, StefanieThe process-integrated powder coating by radial axial rolling of rings represents
a new hybrid production technique that combines the diameter increase of ringshaped
work pieces with the application of functional outer layers [1]. The hot rolling of
the ring is strongly influenced by a coupled temperature field since the forming resistance
of the ring has to be kept under a certain level. The fact that the coating is produced
by powder metallurgy brings up another problem: In conventional ring-rolling processes
the infeed of the axial and the radial rollers in order to increase the ring’s diameter are
controlled by the assumption of volume consistency [6]. But this is not true any more
for a ring exhibiting a compressible layer. Thus attention has to be drawn to a different
coupling scheme of the roller infeed with the current shape of the ring.
The paper deals with the finite element (FE) modelling of this new process. A parameterized
2D model is used to examine the influence of several parameters on the residual
porosity in the layer. Therefore different geometric parameters are examined as well as
the influence of the roller and the ring geometry. It will be shown that the implementation
of a PID control unit is essential to ensure the roundness of the final ring shape [5]. At
the end the simulation results are illustrated.Coupled analysis of transport processes and mechanical behaviour of concrete at high temperaturesCramer, F.Ostermann, L.Kowalsky, U.Dinkler, D.http://hdl.handle.net/2117/3282292020-08-29T02:47:57Z2020-08-27T09:50:35ZCoupled analysis of transport processes and mechanical behaviour of concrete at high temperatures
Cramer, F.; Ostermann, L.; Kowalsky, U.; Dinkler, D.
A model for the numerical analysis of hygro-thermal and mechanical behaviour
of concrete at high temperatures including transport, reaction and deformation
processes is presented. For the description of transport and material behaviour the model
comprises the balance equations for mass and enthalpy and the constitutive equations
for concrete at high temperatures. The degradation of the cement minerals C-S-H and
portlandite is described by two chemical reactions. The consideration of thermo-chemical
damage in the classical non-local damage theory is discussed. Finally, the finite element
formulation for solving the coupled balance equations regarding the primary variables
displacement, temperature and relative humidity is presented and numerical results of a
3-D frame corner are discussed.
2020-08-27T09:50:35ZCramer, F.Ostermann, L.Kowalsky, U.Dinkler, D.A model for the numerical analysis of hygro-thermal and mechanical behaviour
of concrete at high temperatures including transport, reaction and deformation
processes is presented. For the description of transport and material behaviour the model
comprises the balance equations for mass and enthalpy and the constitutive equations
for concrete at high temperatures. The degradation of the cement minerals C-S-H and
portlandite is described by two chemical reactions. The consideration of thermo-chemical
damage in the classical non-local damage theory is discussed. Finally, the finite element
formulation for solving the coupled balance equations regarding the primary variables
displacement, temperature and relative humidity is presented and numerical results of a
3-D frame corner are discussed.Application of a viscoplastic damage model for the failure prediction of regeneratively cooled nozzle structuresTini, VivianVladimirov, Ivaylo N.Reese, Stefaniehttp://hdl.handle.net/2117/3282282020-08-29T02:48:02Z2020-08-27T09:47:26ZApplication of a viscoplastic damage model for the failure prediction of regeneratively cooled nozzle structures
Tini, Vivian; Vladimirov, Ivaylo N.; Reese, Stefanie
Regeneratively cooled nozzle structures belong to the critical components
of a space shuttle main engine. The cooling channel wall in the combustion chamber is
subjected to extreme cyclic thermomechanical loadings which eventually lead to the damage
of the wall, well known as the ”dog-house” effect. A material model for the purpose
of reliable lifetime prediction is being developed. The model shall describe the material
behaviour under hardening conditions as well as the superimposed effect of fatigue which
occurs due to cyclic loadings.
Motivated by extending the classical rheological model for elastoplasticity with Armstrong-
Frederick kinematic hardening, a viscoplastic model is formulated in the small
strain regime. The coupling with damage is performed using the well-known concept of
effective stress and the principle of strain equivalence. Parameter identification on the
basis of experimental results for the high temperature copper alloy NARloy-Z, which is
one of the typical cooling channel liner materials, is performed. The applicability of the
model will be shown by means of sequentially coupled thermomechanical analyses.
2020-08-27T09:47:26ZTini, VivianVladimirov, Ivaylo N.Reese, StefanieRegeneratively cooled nozzle structures belong to the critical components
of a space shuttle main engine. The cooling channel wall in the combustion chamber is
subjected to extreme cyclic thermomechanical loadings which eventually lead to the damage
of the wall, well known as the ”dog-house” effect. A material model for the purpose
of reliable lifetime prediction is being developed. The model shall describe the material
behaviour under hardening conditions as well as the superimposed effect of fatigue which
occurs due to cyclic loadings.
Motivated by extending the classical rheological model for elastoplasticity with Armstrong-
Frederick kinematic hardening, a viscoplastic model is formulated in the small
strain regime. The coupling with damage is performed using the well-known concept of
effective stress and the principle of strain equivalence. Parameter identification on the
basis of experimental results for the high temperature copper alloy NARloy-Z, which is
one of the typical cooling channel liner materials, is performed. The applicability of the
model will be shown by means of sequentially coupled thermomechanical analyses.Aero-thermo-mechanical coupling for flame-wall interactionBaque, B.Errera, M.-P.Roos, A.Feyel, F.Laroche, E.Donjat, D.http://hdl.handle.net/2117/3282272020-08-29T02:47:56Z2020-08-27T09:43:00ZAero-thermo-mechanical coupling for flame-wall interaction
Baque, B.; Errera, M.-P.; Roos, A.; Feyel, F.; Laroche, E.; Donjat, D.
This paper investigates a flame-wall interaction consisting of a premixed flame
impinging on a metallic plate. This is a coupled problem as the heat transfer from the
flame increases the temperature of the plate and bends it, which in turn modifies the shape
of the flame. This study aims at designing an aero-thermo-mechanical coupling between
both codes CEDRE (Computational Fluid Dynamics) and Z-SeT (computational solid
mechanics and heat conduction) to simulate this complex system. Numerical results for
aero-thermal coupling are compared with experimental data.
2020-08-27T09:43:00ZBaque, B.Errera, M.-P.Roos, A.Feyel, F.Laroche, E.Donjat, D.This paper investigates a flame-wall interaction consisting of a premixed flame
impinging on a metallic plate. This is a coupled problem as the heat transfer from the
flame increases the temperature of the plate and bends it, which in turn modifies the shape
of the flame. This study aims at designing an aero-thermo-mechanical coupling between
both codes CEDRE (Computational Fluid Dynamics) and Z-SeT (computational solid
mechanics and heat conduction) to simulate this complex system. Numerical results for
aero-thermal coupling are compared with experimental data.