document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 6.17 - Aerothermodynamics TRP Reference: T601-25MP Development of advanced models and acceleration of Monte Carlo methods for Title: simulation of rarefied gas dynamics The objective of this activity is to improve the DSMC tools for analysis and design of tree molecular and transitional fluid dynamic phenomena such as oftware plume contamination, plume interaction and heating, vehicle reentry and/or destruction ATD, satellite environment assessment, and Mems analysis (micro thrusters). The following taks will be done: - Development and implementation of advanced models for chemistry and relaxation (diatomic and polyatomic gases) that take into account the quantum nature of internal energy modes and vibration-dissocciation coupling. Verification and validation of developed models via comparisons with available experimental data- Creation of majorant frequency schemes based on master kinetic equation (MKE) for an implicit treatment of the collision processes.- Development hybrid approaches combining continuum and kinetic descriptions of the flow, kinetic schemes of gas dynamics should be used to facilitate the automatic domain decomposition and coupling of MC solution with continuum equations. A unified computer code should automatically switch between kinetic and continuum models to maximize computational efficiency and ensure numerical stability.- Creation of an object-oriented software (OOS) system using C++ language and based on RGDAS software. This OOS system should include above mentioned models and approaches and permit to compute 2D, axisymmetric and 3D plume flows and their interactions with the spacecraft; incorporates pre- and post-processing systems that enable the use by non-expert users; reduces the time to set-up + run complex simulations from months to days.The proposed activity is aimed at the development of a single European DSMC code for realistic 3d configurations, physically accurate, for simulation of rarefied flows ranging from suborbital to ground-test-facility conditions. The code could be developed as a modular, possibly object-oriented, program, in a open-source environment and with an open architecture which will allow maximum flexibility and modularity. Deliverables: European DSMC tool , open source , for simulation of rarefied and transitional flow phenomena. Current TRL: Target TRL: Application Need/Date: SW operational by TRL2 S/W release 2007-2008 all satellites / re-entry vehicles (high Application/Mission: Contract Duration: 12 months altitude); Exploration, EO, EOPP SW Clause : - Dossier0 Ref.: T-7901 Consistency with Harmonisation Roadmap and Conclusions: TRP Reference: T601-28MP Title: Feasibility Demonstration of a European Space Propulsion Simulation Tool The purpose is to demonstrate, as an extension of an already existing common environment, a mechanical engineering simulation tool for transient multi-disciplinary systems and cycles (e.g. spacecraft systems, chemical and electrical propulsion cycles, ground support equipment & operations, ground/qualification tests,...) to be used by European space industries, research institutes and universities. Due to the intrinsic complexity of this activity, the feasibility of the concept should first be demonstrated, allowing:The proof of concept to couple several mechanical disciplines (fluid flow, thermal, machinery, electrical, chemistry...) into one single engineering analysis tool.The proof of concept to reduced modelling of particular physical processes in space environments along with appropriate validation.The proof of concept to run in a temporally unsteady way a system and/or a cycle where the different demonstration models and discipline couplings are integrated. Deliverables: Demonstration model. Current TRL: - Target TRL: Prototype Application Need/Date: SW Operational by 2010 Application/Mission: Launcher and satellite propulsion Contract Duration: 18 months SW Clause : Operational SW Dossier0 Ref.: Consistency with Harmonisation Roadmap and Conclusions: Roadmap: 2nd sem. 2004 - 1st sem. 2005 Page 191 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T601-48MP Validation of aerothermo chemistry models for reentry applications Improvement of the measurement techniques associated with radiation spectral measurements in hypersonic shock tubes and plasmatrons. Performance of dedicated experiments using appropriate gases simulating planetary and earth reentry mission. Based on these validation experiments, improved physical models will be developed using ab initio modelling techniques consistent with the physics of flight. Here special support will be required from universities competent in the field. In a first phase emphasis will be put on post flight analysis of the Huygens mission. In a second phase , in addition to the shock layer radiation coupling activities, gas surface interaction experiments shall be performed for improved ablation, catalysis and oxidation modelling. Here experiments shall be performed in solar furnaces and at universities where specific expertise exists on gas surface recombination modelling as well as in plasmarons to obtain catalysis and oxidation data on a set of preselected materials used as TPS for planetary and earth exploration vehicles. Deliverables: Improved and demonstrated physical models for inclusion into aerothermodynamic and thermal protection system design tools for application in space vehicle design associated with planetary entry as well as high speed earth reentry missions. Current TRL: Target TRL: S/W release Application Need/Date: TRL5 >2011 Application/Mission: re-entry applications, explorations Contract Duration: 24 months SW Clause : Operational SW Dossier0 Ref.: T-7897 Consistency with Harmonisation Roadmap and Conclusions: TRP Reference: T601-49MP Hypersonic facility instrumentation enhancements for improved flight extrapolation and Title: scaling It is proposed to demonstrate the capabilities which hot hypersonic wind tunnels can offer to current and future programmes associated with re-entry. What industry is interested in most when performing design work is the influence of high-temperature effects not only on thermal and mechanical loads but, in particular, on forces and moments in order to have a sound data base for the choice of trajectory, material and so forth. The assured knowledge of such properties would also allow to further validate computational prediction methods and models. A suitable approach is to perform some kind of standard model testing, i.e. using – if possible – the same test model in all wind tunnels. Two models should be considered, one which allows to measure pressure and temperature (heat transfer), and one to determine forces and moments (giving priority to the latter). These data would permit cross checking for validation of prediction methods. After consultation with industry a suitable lifting body, such as the HALIS model (which duplicates exactly the lower surface of the US ORBITER), and the ballistic model EXPERT shall be selected. In order to better demonstrate and clarify the effect of high temperatures on e.g. forces one should consider carrying out experiments also in classical cold hypersonic wind tunnels using the same models. The activity shall include: well characterized ground based hypersonic facilities, improved nozzle calibrations thanks to the development of advanced instrumentation enabling full hypersonic free stream nozzle calibration; testing of the EXPERT and HAlIS configuration in these high enthalpy facilities will provide a unique opportunity to study real gas effects thereby consolidating the uncertainties associated with windtunnel to flight extrapolation and scaling. Deliverables: Facilities characterization. Improved nozzle calibrations. Current TRL: TRL2 Target TRL: TRL3-4 Application Need/Date: TRL5 >2009 all re-entry missions; launcher, Application/Mission: Contract Duration: 24 months exploration, .. SW Clause : - Dossier0 Ref.: T-7904 Consistency with Harmonisation Roadmap and Conclusions: Page 192 of 227
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