AcuSolve Case Study. Summary. 30[m/s] 20. Analysis of actual flying condition. Aerodynamic analysis with rolling tire and pitching body

Transcription

1 AcuSolve Case Study 2013/01/10 JSOL Corporation Engineering Technology Division Fluid Dynamics Engineering Department Case Study 1. Flying Golf Ball Summary Analysis of actual flying condition 2. Vehicle pitching Aerodynamic analysis with rolling tire and pitching body 3. Comparison with experimental result 4. Biomedical Application 30[m/s] 20 Airflow analysis during breathing 1

2 Analysis of flying golf ball» Actual flying condition is required» Not like a wind tunnel testing Flying Golf Ball Motionless (or only rotation) region around the ball ball Move the region around the ball to fit the movement of the ball. 2 Flying Golf ball domain around the ball (analysis space) ball 30[m/s] [rpm] Nth step Move the ball at the (N+1)th step move the region to fit the ball movement MCD method (Moving Computational Domain) 3

3 Flying Golf ball Case1 Case2 Case3 30[m/s] 20 30[m/s] 20 30[m/s] [rpm] 0[rpm] 2000[rpm] rotation axis is displaced 30 degrees around the vertical axis Case2 Case1 4 Flying Golf ball 5

4 Flying Golf ball 6 Vehicle pitching 7

5 The vehicle motion is given Vehicle pitching» Tires are given the rotational motion» Body is given the sine vibration (up-and-down)» Use the ALE function Outlet rotation sine vibration Inlet 8 Vehicle pitching Actual driving condition can be evaluated by AcuSolve.» It needs transient analysis to calculate pitching.» The analysis with only tire rotation is usual by static analysis.» However, permanently flat load is NOT realistic, so pitching is a key movement to evaluate a vehicle performance.» AcuSolve has achieved a huge size transient analysis.» It was not realistic for past analysis code due to high calculation cost.» At first, a big car maker s CFD engineer did not believe this calculation to be done. rotation sine vibration Now, they are seriously considering the use of AcuSolve. 9

6 Comparison with experimental result» Background» Customer: a big electric-appliance maker» Goal: To keep coil s temperature lower in downsizing of high-powered motor.» It takes much cost to make a prototype with each case.» They want to replace the experiment with analysis.» JSOL proposed to compare the experimental result to the calculation result by AcuSolve. 10 Actual equipment 3D CAD model Bracket Insulator Coil Case 11

7 12 Copyright 2012JSOL JSOLCorporation CorporationAll AllRights RightsReserved Reserved Copyright (c) 2013 Experimental 1.9A 8.84W Experimental 2.8A 22.0W Experimental 3.8A 45.5W AcuSolve 1.9A 8.84W Increased temperature AcuSolve 2.8A 22.0W Y-Velocity AcuSolve 3.8A 45.5W Temperature Measure point The calculated data by AcuSolve were coincident with the experimental data. Copyright 2012JSOL JSOLCorporation CorporationAll AllRights RightsReserved Reserved Copyright (c) w 13

8 With insulator coating Experimental 1.9A 8.84W Experimental 2.8A 21.7W Experimental 3.8A 44.1W Increased temperature AcuSolve 1.9A 8.84W AcuSolve 2.8A 21.7W Y-Velocity AcuSolve 3.8A 44.1W Temperature Measure point AcuSolveでの熱流体解析の結果 モータ各部の温度上昇 The calculated data by AcuSolve were coincident with the experimental data. 分布 は 実験結果をよく再現できていると考えられる 44.1w 14 Copyright 2012JSOL JSOLCorporation CorporationAll AllRights RightsReserved Reserved Copyright (c) 2013 For more realistic simulation, transient analysis is required. One key is the heat transfer coefficient.» Currently, most of heat simulation is according to constant coefficient by experiment.» Time series data and distribution data is important to get accurate temperature. AcuSolve make it possible to solve the coefficient itself. Some makers are considering how to apply this achievement of AcuSolve ex. coupling with electro-magnetic analysis like JMAG. Copyright 2012JSOL JSOLCorporation CorporationAll AllRights RightsReserved Reserved Copyright (c) 2013 distribution of heat transfer coefficient 15

9 Biomedical Application Airflow analysis during breathing under moving boundary condition Free software for generating 4D (= 3D + time) finite element models of the human lung is released on Dr. Kitaoka s personal website. (or search for Lung4cer ) 16 Biomedical Application Breathing lung simulator» Combination of 1. 4D model generator of the human lung (free) 2. AcuSolve 3. Visualizer (ex. ParaView)» Common PC can perform the job ( ex. 4 core, 8 GB memory).» Easy to handle, quick to compute, easy to assess the accuracy, and useful to study the lung mechanics. 17

10 Biomedical Application Simultaneous computation from the trachea to alveoli Inspiration at rest causes airflow with 2 m/s in the trachea and 0.2 mm/s in alveoli. 18 Biomedical Application Oxygen transport simulation from the trachea to alveoli The inspired air with 21 % oxygen may not reach gas-exchange place. Oxygen concentration at a terminal bronchiole is much lower than 21 %. 19

11 Biomedical Application Pulmonary function test simulation 20 Contact Us Engineering Technology Division Tokyo Head Office Harumi Center Bldg Harumi, Chuo-ku, Tokyo Osaka Head Office Tosabori Daibiru Bldg Tosabori, Nishi-ku, Osaka Nagoya Office Marunouchi KS Bldg Marunouchi, Naka-ku, Nagoya Copyright (c) JSOL Corporation All All Rights Reserved 21