Thermal Desktop / STAR-CCM+ Co-Simulation. Prepared for the STAR Global Conference Matt Garrett CRTech March 17, 2015

Transcription

1 Thermal Desktop / STAR-CCM+ Co-Simulation Prepared for the STAR Global Conference Matt Garrett CRTech March 17, 2015

2 THERMAL DESKTOP OVERVIEW 2

3 CRTech Background Founded in users in 40 countries Selected Customers: Products: NASA (standard thermal tool at all centers, site license), Boeing (standard thermal tool at all facilities, site license), Lockheed Martin (standard thermal tool at most facilities), Others: Aerospace Corp., Aerospatiale, DLR, General Motors, Goodrich, Hamilton Sundstrand, Jacobs Sverdrup, Kawasaki, Los Alamos National Lab, Mitsubishi, Northrop Grumman, Orbital Sciences, Raytheon, Sandia, Thales-Alenia, Toshiba, ULA, U.S. Air Force, Army and Navy, ZF Friedrichshafen Thermal Desktop (3-D pre- and post-processing) RadCAD: orbital heating, radiation, complex conduction FloCAD: fluid network in CAD for piping, vessels, convection with thermal structures SINDA/FLUINT (thermal and fluid network solver) TD Direct (geometry cleanup and meshing) 3

4 Thermal Desktop Suite Solves thermal and fluid networks using lumped parameter methods Commonly used to create system-level models Complements CFD Fast radiation calculations with RadCAD Transient, articulating geometry, specular reflection, transmission, wavelength-dependence, etc. Empirical, fast-solving fluid network models with FloCAD Transient, multi-phase, multi-species, compressible Built-in flow network components Turbines, pumps, compressors, heat exchangers Orifices, valves, tees, bends, wall friction Variable-molecular weight fluids, reacting flows Used for: capillary loops, heat exchangers, water hammer, etc. Simultaneous thermal and fluid solutions Optimization and reliability calculations 4

5 CUSTOMERS USING CFD AND THERMAL DESKTOP TOGETHER 5

6 STAR-CCM+ Model of Upper Stage Tanks Coupled to TD Model of Piping/Structure 6

7 SNC Dream Chaser Cabin CFD Applied to TD Model 7

8 NASA JPL Curiosity Rover CFD Applied to TD Model 8

9 Boeing Primary Exhaust CFD Applied to TD Model 9

10 NASA KSC Flame Deflector CFD Applied to TD Model From Modeling of Heat Transfer and Ablation of Refractory Material due to Rocket Plume Impingement, Michael F. Harris (QinetiQ), Dr. Bruce T. Vu (NASA KSC), Proceedings of the NASA Thermal and Fluids Analysis Workshop 2012, Pasadena, California 10

11 Anti-Ice Exhaust CFD Applied to TD Model of Nacelle 11

12 VISION FOR THE FUTURE 12

13 Tight Coupling of STAR-CCM+ and Thermal Desktop 13

14 Loose Coupling Example: Using STAR-CCM+ to Model Tee in a Sprinkler System Pressure drop in Tee based on correlation with uncertain validity. Desirable to test/replace with CFD results. 14

15 FloCAD Sprinkler Model with STAR-CCM+ Tee Model 15

16 Summary CRTech Thermal Desktop complements CFD Fast-solving, system-level, transient models Radiation 1D piping networks with multi-phase, multi-species flow Customers already using STAR-CCM+ and Thermal Desktop together CRTech and CD-adapco are working to make using STAR-CCM+ and Thermal Desktop together better and easier 16

17 BACKUP SLIDES 17

18 FloCAD Sprinkler Model Tee K Correlation 18

19 Aeroheating Loose coupling TD system-level model of a vehicle performing transient analysis of re-entry, initialized with orbital results STAR-CCM+ model supplies external fluxes during re-entry TD Boundary Condition Mapper used to input data Already used by TD customers Will determine best practices for STAR mesh type and density 19

20 Compartment and Cabin Air Tight coupling TD system-level model of a vehicle (thermal and piping) and passengers coupled with STAR-CCM+ model of compartments and/or cabin 20

21 Prelaunch Purge Loose coupling System-level spacecraft and launch vehicle model in TD STAR-CCM+ model provides fluxes from purge air to spacecraft and launch vehicle Alternative: automatically create reduced-order fluid model in TD from STAR-CCM+ model For U.S. launches, spacecraft models are typically built and certified using Thermal Desktop, then integrated with standard launch vehicle models, also built in TD. 21

22 Rocket Nozzle Tight coupling STAR-CCM+ model of primary flow coupled to TD model of cooling channels and associated piping 22

23 Aircraft Fire or Burst Duct Modeling Loose or tight coupling TD system-level model of aircraft assembly Coupled to STAR-CCM+ model of compartment with fire/hot jet, or uncoupled STAR-CCM+ model of fire/hot jet provides fluxes to aircraft structure 23

24 Fire Suppression System Tight coupling STAR-CCM+ model of room and spray from nozzles TD model of supply piping 24

25 Electronics Cooling Tight or loose coupling Example 1: Heat Sinks (and perhaps Fans) STAR model of heat sinks for performance characterization (by-pass ratios, effectiveness) TD model of electronics and structure, including transients and system-level studies Example 2: Box-level STAR model of flow through compartments, around boards (velocities, heat transfer coefficient averages) TD model at board, chassis, or compartment level, including any liquid cooling devices 25

26 Cryo Tank Loose coupling Example 1: Initial cold gas fill Cold vapor enters before liquid does, and stresses light-weight structures. TD can take over efficiently once liquid enters and dominates. Requires a hand-off: mapping of STAR final conditions to TD initial conditions Example 2: Stratified tank recirculation TD supplied system-level boundary conditions STAR estimation of recirculation (boundary layer) velocities and perhaps effective heat transfer coefficients (to both wall and surface) TD estimations of drain profiles (liquid temps), pressure control system events 26