EXA_PowerFlow新一代CFD工程软件.ppt

Application: Naval Application: Naval Free stream air flow Application: Architectural Eng. European Southern Observatory European Southern Observatory Application: AEC Conclusion Boltzmann based VLES offers advantages both in fundamental physics and efficient computations Realizability for complex geometries is essential for engineering problems, together with completely automated grid generation CFD has now started to make real impact in practical engineering designs in a wide range of industries * Channel Flow: Cf vs Re Backward Facing Step Backstep – Cp Upper Surf vs. Res Backstep – Cp Lower Surf vs. Res Backstep – Velocity Profiles Backstep – K Profiles ASMO – Cp Upper Surf Delta Wing - AOA 20.5o Ford Aerodynamic Shapes Reference: SAE 00PC-229 SAE 940323 ______________________________________ Release 3.2 (Registry 1617) BMW G R E E N M O D E L COMPARISON WITH EXPERIMENT Top Centerline (Geometry not to scale) Bottom Centerline (Geometry not to scale) PowerFLOW3.2 Experiment Comparison to Experiment PowerFLOW 3.2 Simulation Experimental Oil Flow Patterns Separation From Rounded Edges Reattachment Recirculation Roll-Over C1 Centerline Cp (upper/lower) Drag: Exp: 0.161 3.1: 0.185 3.2: 0.160 3.3-a 0.163 Audi A2 Audi A2 - Total Pressure (center) Experiment (Ma=0.113) Experiment PowerFLOW 3.3 Improvement of aerodynamic properties by integration of strips in the tail lights? well defined side seperation edges Sensitive separations Subtle Vortex Structures Mercedes Aclass Hydrogen Bubbles in Watertunnel Application: Auto Underhood Drag Summary Comparison Stylized Car Bodies Production Car Bodies Application: Motor Sports Application: Heavy Trucks Aeroacoustics Left Ear 3D Wedgebox 3D Wedgebox – Probe Locations 1 2 3 4 5 Log-Log Plot: Experiment Experiment PowerFLOW 3D Wedgebox: Power Spectra Application: Trains Wind Direction Application: Auto Underhood Over 75 Separate Parts Application: HVAC Heater On A/C On Application: Climate Control Application: I