Numerical Simulation of Airflow and Acoustic Field Around a Passenger Car Model Using Euler Approach and Hybrid Meshing

2017 ◽  
pp. 323-336
Author(s):  
Oskar Szulc ◽  
Piotr Doerffer
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Passenger Car ◽  
Car Model ◽  
Euler Approach

scholarly journals NUMERICAL SIMULATION OF AIRFLOW AROUND VEHICLE MODELS

2018 ◽  
Vol 56 (3) ◽  
pp. 370
Author(s):  
Nguyen Van Thang ◽  
Ha Tien Vinh ◽  
Bui Dinh Tri ◽  
Nguyen Duy Trong
Keyword(s):  
Numerical Simulation ◽  
Kinetic Energy ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Forces ◽  
Dissipation Energy ◽  
Ansys Fluent ◽  
Car Model ◽  
Airflow Field ◽  
Fluent Software

This article carries out the numerical simulation of airflow over three dimensional car models using ANSYS Fluent software. The calculations have been performed by using realizable k-e turbulence model. The external airflow field of the simplified BMV M6 model with or without a wing is simulated. Several aerodynamic characteristics such as pressure distribution, velocity contours, velocity vectors, streamlines, turbulence kinetic energy and turbulence dissipation energy are analyzed in this study. The aerodynamic forces acting on the car model is calculated and compared with other authors.

Numerical Simulation of Acoustic Field for the Miniature Cylindrical Transducer with a Rectangular Hole

2011 ◽  
Vol 421 ◽  
pp. 739-742
Author(s):  
Li Li Yu ◽  
Jin Hua Zhao ◽  
Quan Zhou Zhao ◽  
Chun Hui
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Focal Plane ◽  
Optimization Design ◽  
Acoustic Pressure ◽  
Pressure Amplitude ◽  
Hole Size ◽  
Rectangular Hole ◽  
Cylindrical Transducer ◽  
Focusing Properties

In this paper the characteristics of acoustic field for miniature cylindrical focused transducer with a hole was studied in order to instruct the optimization design of the transducer for both realizing visualization and improving the treatment effect. Then the acoustic field was simulated numerically with different parameters of hole. It is found that position of focus is almost unchanged but acoustic pressure amplitude declines. In addition the performance of transverse focusing for the focal plane and levels length of acoustic pressure are lowered. Moreover, if size of transducer and rigidity of material permit, the area and ratio of width to height for the hole should be reduced appropriately to improve the focusing properties. And it is deduced that area and ratio of width to height for the cylinder can be increased to achieve the same therapeutic effect with a fixed hole size.

Theoretical investigation of a linear planar model of a passenger car with seated people

2003 ◽  
Vol 217 (4) ◽  
pp. 257-268 ◽  
Author(s):  
G J Stein ◽  
P Múčka
Keyword(s):  
The Body ◽  
Human Model ◽  
Vertical Acceleration ◽  
Traffic Light ◽  
Passenger Car ◽  
Response Characteristics ◽  
Car Model ◽  
Simulation Results ◽  
Gravity Acceleration ◽  
Road Crossing

This paper deals with simulation results of a planar passenger car model, supposed to simulate a ‘standard European saloon car’, with simple linear cushioned seats and a seated human model, which accounts for variation in the body weight. As excitation a short harmonic undulation (so called ‘rollete’) is used, sometimes encountered ahead of traffic-light-controlled road crossings. The simulation results indicate some dependence of the respective frequency response characteristics on the stipulated driver's and passenger's weights. Further large vertical acceleration values at axle hop frequencies are observed, which may under circumstances even exceed the standard gravity acceleration. These decrease with increased traversing velocity, say, above 50 km/h to bearable values. Further it is illustrated that the visibility of lights or signs may be momentarily impaired when accelerating from standstill at a road crossing with a large ‘rollete’ directly before the crossing.

scholarly journals Access Bridge Design Measures for Safety Increase of the Road Infrastructure

2013 ◽  
Vol 25 (6) ◽  
pp. 543-554 ◽  
Author(s):  
Tomas Micunek ◽  
Zuzana Schejbalova ◽  
Drahomir Schmidt
Keyword(s):  
Numerical Simulation ◽  
Detailed Analysis ◽  
Deformation Zone ◽  
Technical Solution ◽  
Drainage Ditch ◽  
Bridge Design ◽  
Passenger Car ◽  
The Road ◽  
Traffic Lane ◽  
Current Design

Solid barriers represent danger for the driver in case of traffic lane escape. This threat can be represented by a drainage ditch culvert face. The access bridge is not usually conspicuous enough near the traffic lane so that the driver could ditch and crash this barrier in case of an exceptional situation such as avoidance manoeuvres. This work deals with a technical solution of access bridges with an integrated deformation zone which was designed on the ground of a detailed analysis of current types of the construction. The new technical solution was proved by means of a numerical simulation of passenger car impact and compared with the current design of culvert faces.

scholarly journals Numerical simulation of an acoustic field generated by a phased arc array in a fluid-filled cased borehole

2014 ◽  
Vol 11 (3) ◽  
pp. 385-390 ◽  
Author(s):  
Xiaohua Che ◽  
Wenxiao Qiao ◽  
Ruijia Wang ◽  
Yuhong Zhao
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Cased Borehole
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