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INTRODUCTION to the WORKSHOP Dr. G. Ortega 2021, May 11Th

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INTRODUCTION to the WORKSHOP Dr. G. Ortega 2021, May 11Th INTRODUCTION to the WORKSHOP Dr. G. Ortega 2021, May 11th ESA UNCLASSIFIED - For Official Use 1 …the process of technology 1 I have a great idea! 2 I write a proposal 3 My proposal is approved 4 I execute the activity of the proposal 2 Welcome ! •Original idea of the TEC-MPA Section of ESA and materialized in 2021 •Is there any interest on Will the idea of the discussion ideas for technology pre-discussions work? prior we make any kind of proposal? •Number of registrations: 161 3 Objectives • Objective 1: Provide for an overview of the current state of technology ideas • Objective 2: Gather inputs from possible Bidders • Objective 3: Prioritize the upcoming research and development inputs to the ESA technology plans (TRP, GSTP) for the coming cycle 4 Scope of the Workshop • 1) Technology for the architecture design, analysis and technical assessment of space transportation vehicles for suborbital, orbital and exploration applications, including upper stages, (re)-entry, expendable, and reusable vehicles • 2) Technology for the development of tools and techniques for the feasibility and viability assessments, and quick design iterations of flight vehicles • 3) Technology for flight vehicles, flight physics, aerodynamics, thermodynamics and fluid dynamics engineering and the architecture design and analysis of suborbital, (re-)entry, space transportation, and exploration vehicles 5 Time Line 1 2 3 4 5 May June September October November Workshop Consolidation of Final list of the best Preparation of Introduction of the ideas ideas (including upcoming TDE ideas in ESA description) cycle internal system 6 The program 7 Can I take your idea and ….? •No, please •The ideas are provided to you with the aim of discussion •The information should not be used to move the ideas to non-ESA technology programs 8 I have another idea… •Can I please discuss with you privately? •Yes, of course. No problem. See points of contact 9 ESA points of contact Csaba Jeroen Johan Luca Louis Orr Richard Stephan Victor 10 Thank you to the organizers! Csaba Orr Stephan 11 Have a great Workshop! ESA UNCLASSIFIED - For Official Use 12 Day 1 13 Prediction Fluid Dynamics Methods for Propellant Tanks Prog. GSTP Budget: 800K Duration: 24 months Aim: A Ref.: A 04 TRL: 4 to 5 Objective(s): To develop prediction methods for cryogenic multi-phase flows to application level and provide experimental data from breadboard, on ground micro gravity facilities and flight experiments that can be utilized to validate such methods. Quantification of margins of uncertainty for experimental and numerical data shall be investigated, in detail. Description Numerical techniques are developed and validated in a structured manner for the different relevant environments from ground conditions to micro gravity and isothermal single phase applications to non-isothermal with phase changes. Incremental validation is applied, i.e. all new levels of modelling have to demonstrate that all lower levels of required modelling and complexity can still be treated successfully. Resulting CFD tools are required to be computationally efficient, empirical models shall be proposed to avoid excessive computational effort for flow accurate prediction of phenomena that require very high temporal spatial resolution of the applied CFD method. Quantifiable margins of uncertainty as consequence of incomplete modelling have to be accepted to allow calculation of flow configurations that are typical for todays applications. Background and previous activities Long history of CFD development and related validation testing. Technical Officer: Richard Schwane ([email protected]) 14 Interaction of Fluid and Structures under Sloshing Conditions Prog. GSTP Budget 800K Duration: 24 months Aim: A Ref.: A 05 TRL: 4 to 5 Objective(s) This activity shall assess functionality of FSI methods for the prediction of fluid motion and structure response, resulting forces on structures and effect on space craft trajectory and attitude. Storable propellants, commonly used in satellites and cryogenic propellants used on launch vehicles shall be considered. Material characteristics of tanks and support frames shall be analyzed for cryogenic applications. To prepare refueling of cryogenic tanks in orbit, also flow kinematics of valves, bubble pressure grids and vanes shall be investigated. Description Sloshing creates forces on structure elements that are transmitted to the spacecraft. Such forces have an effect on spacecraft dynamics and have to be known by the GNC system to provide commands to attitude control systems to keep the spacecraft in a stable and controlled condition. Material properties, including materials that might show advantages for the specific requirements of fuel reservoirs in orbit shall be investigated in detail, considering also cryogenic conditions. Membranes as PMD for storable propellants allow extended exposure time to fuel, similar improvement for oxidizers are in progress. Utilization of membranes that separate fluid and gas content of a tank are therefore promising, since the complex multi-phase flow image fields of free surface tanks, are avoided. The contractor shall assess, if present FSI methods, based on available material data of membranes, can reliably predict topology of membrane and kinematics of the fuel, forces on membrane and structures. Missing material data shall be identified and reported. Finally, a detailed analysis of the resulting margins of uncertainty for the coupled FSI result shall be provided. The contractor shall propose means to reduce the margins by improved modelling of liquid motion and / or structural response. Background and previous activities Prediction of sloshing motion in tanks can be predicted well for large gravity. For capillary flows with small Bond numbers, surface tension and contact angles are presently not known already for ideal liquids, certainly not for cryogenic conditions. Numerically efficient solution methods, e.g. solving Navier Stokes equations for the kinematics of a fluid mass in a tank that is exposed to external acceleration require empirical data for contact angle and interface models that are presently not available for cryogenic liquids in micro gravity. Technical Officer: Richard Schwane ([email protected]) 15 Toolset for the Design of Cryogenic Systems Prog. TDE Budget 500K Duration: 24 months Aim: A Ref.: A 07 TRL: 2 to 3 Objective(s) Development and validation of tools for cryogenic systems, e.g. a cryogenic reservoir in orbit. Exiting tools, e.g. boil-off tools shall be critically reviewed, margins shall be identified and related to margins acceptable for design. Tools shall be updated by introduction of more accurate modelling methods and the result on the overall prediction error shall be estimated. Description An existing and published integral tool, here for boil-off in a LH2 or methane reservoir in orbit shall be systematically checked for short-comings and updated to a level that allows application to complex cryogenic systems. Updates can include replacing empirical models, e.g. for heat transfer between liquid fuel and tank structures by more detailed CFD rebuilding, if justified and affordable. The dependency of prediction accuracy on time and particular nodal representation (e.g. number and arrangement of nodes) shall be quantified. Thorough validation of tool performance and accurate estimation of remaining margins of uncertainty is considered a pre-requisite for image successful tool application and is therefore considered the most important outcome of this activity. Background and previous activities Presently, validated tools for design of complex cryogenic systems do not exist, but simplified tools, as the present boil-off tool are frequently used for optimization tasks. Tool application to design requires detailed knowledge on tool accuracy. Technical Officer: Richard Schwane ([email protected]) 16 Material Point Method for Sloshing and Multiphase Flows Prog. GSTP Budget 300K Duration: 18 months Aim: A Ref.: A 11 TRL: 4 to 5 Objective(s) Review, improve and document functionality, including accuracy, computational efficiency and robustness of dual Eulerian and Lagrangian CFD methods for the description of multi-phase flows. Description: Presently, multi-phase flows are predicted with numerical schemes that solve for conservation of mass, momentum and energy with added empirical models for physical aspects of the solution that are not covered by conservation properties. In this activity conservation schemes (Eulerian description) and particle methods (Lagrange description) are combined in one numerical method that is not dependent on, often difficult to obtain, empirical models or data for missing physics. This activity shall review existing dual schemes, particularly MPM and SPH schemes for their image ability to rebuild complex multi-phase flows, propose and introduce scheme updates and demonstrate functionality as cost, accuracy and robustness of such advanced schemes, if compared to Navier Stokes and empirical modelling. Background and previous activities Accurate description of even physically simple, i.e. isothermal multi-phase flows is still a challenge for conservation schemes, e.g. the Navier Stokes equations. Advanced numerical methods that include all physics required to rebuild the flow field and, simultaneously the free interface topology in the flow field without the need for additional empirical data from experiments are systematically examined for their potential to improve prediction
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