ATD3 Workshop 2022

Session

Modelling, Simulations & Tools

27 Oct 2022, 14:15

Bordeaux, France

131. CFD based interpolation of drag and heat rates of different objects re-entering the earth atmosphere in a prescribed motion and approximation models for drag and heat rates of random tumbling objects in the transitional regime - Part1

Pierre Van Hauwaert (RTech Engineering BV)

27/10/2022, 14:15

Re-entry simulation tools

Presentation

Risk assessment of uncontrolled debris re-entering the atmosphere depends on various parameters among which drag and heat rates play a major role. However, those parameters cannot be computed with high fidelity methods such as CFD (Computational Fluid Dynamics) within a reasonable time frame for a full earth re-entry. Thus, correlations are usually used in spacecraft demise codes that use the...

132. CFD based interpolation of drag and heat rates of different objects re-entering the earth atmosphere in a prescribed motion and approximation models for drag and heat rates of random tumbling objects in the transitional regime - part2

Pierre Van Hauwaert (RTech Engineering BV)

27/10/2022, 14:40

Re-entry simulation tools

Presentation

Risk assessment of uncontrolled debris re-entering the atmosphere depends on various parameters among which drag and heat rates play a major role. However, those parameters cannot be computed with high fidelity methods such as CFD (Computational Fluid Dynamics) within a reasonable time frame for a full earth re-entry. Thus, correlations are usually used in spacecraft demise codes that use the...

125. Data-Driven Approach for the Prediction of Aerothermal Loads during Destructive Atmospheric Re-entry

Ms Julie Graham (University of Strathclyde)

27/10/2022, 15:05

Re-entry simulation tools

Presentation

Simulating destructive re-entry is a demanding task that requires the modelling of non-equilibrium and high-temperature aerothermodynamics, structural and flight dynamics in presence of interacting shock waves, structural deformation, fragmentation and intense heat and mass transfer mechanisms. Three categories of methods can be identified to model re-entry: object-oriented,...

129. Coupling Methodology for SU2-NEMO and PATO Solvers

Mutlu Çelik (Middle East Technical University)

27/10/2022, 15:30

Re-entry simulation tools

Presentation

The present study aims at proposing a methodology for coupling the non-equilibrium modelling solver(NEMO) of open source CFD software SU2 Multiphysics with the open source ablation solver Porous material Analysis Toolbox(PATO). SU2-NEMO solves Navier Stokes equations with thermochemical non-equilibrium effects by using finite volume method. Surface heat flux and pressure distribution of...

115. Progress on the Conservative Cut-Cell Immersed Boundary Solver for Accurate Simulation of Atmospheric Entry Flows with Gas-Surface Interactions

Ata Onur Baskaya (Aerodynamics Group, Faculty of Aerospace Engineering, TU Delft, The Netherlands)

27/10/2022, 16:20

Material characterization

Presentation

During atmospheric entry, capsules and space debris are exposed to a flow environment with complex fluid thermochemistry and gas-surface interactions (GSI) that may lead to mass loss and shape change. A promising approach for the numerical simulation of such challenging flows is the use of immersed boundary (IB) and adaptive mesh refinement (AMR) techniques, which offer reliable and efficient...

118. Coupled fluid / thermal computation of ablating graphite material using nonequilibrium chemistry during atmospheric entry

Vivien Loridan

27/10/2022, 16:45

Fragmentation, ablation phenomena

Presentation

The present work aims at improving the numerical prediction of graphite material degradation during an entire reentry phase. For this purpose, 2D axisymmetric simulations are carried out on the nosetip of the IRV-2 vehicle, which is a well-referred test case that employed a thermal protection system composed of non-charring carbon. The coupled fluid / thermal approach adopted for such...

130. Overview of the recent studies performed at CEA-CESTA on rarefied flow simulation and modelling

Dr Damien TOUSSAINT (CEA-CESTA)

28/10/2022, 09:10

High altitude regime Aerothermodynamics

Presentation

During an atmospheric re-entry, a vehicle crosses at very high speeds the distinct atmospheric layers characterised by large density variations. The vehicle thus experiences several flow regimes, ranging from free molecular, rarefied (transition, slip) and continuous regimes. These regimes are commonly characterised by a Knudsen number (Kn) range [Kn is defined as the ratio of the mean free...