Parallel numerical simulation of wake vortex detection using rass

Said Boluriaan, Philip John Morris

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

A parallel, two-dimensional Euler, one-dimensional Maxwell code is developed to numerically simulate wake vortex detection using a Radio Acoustic Sounding System (RASS). The code is written in Fortran 90 with the Message Passing Interface (MPI) for parallel implementation. The main difficulty with a time accurate simulation is the number of samples required to resolve the Doppler shift in the scattered electromagnetic signal. Even for a ID simulation with typical scatterer size, the CPU time required to run the code is far beyond currently available computer resources. Two alternatives that overcome this problem are described. In the first the code is run for a fictitious speed of light. Second, the governing differential equations are recast in order to remove the carrier frequency and solve only for the frequency shift using an implicit scheme with large time steps. The numerical stability characteristics of the resulting discretized equation with complex coefficients are shown. The code is run for both the approaches with Taylor and Oseen vortex velocity profiles. Finally, the Abel transform is applied to the outputs of both explicit and implicit schemes, and the wake vortex velocity field is retrieved with very good accuracy.

Original languageEnglish (US)
StatePublished - Dec 1 2000
Event6th Aeroacoustics Conference and Exhibit, 2000 - Lahaina, HI, United States
Duration: Jun 12 2000Jun 14 2000

Other

Other6th Aeroacoustics Conference and Exhibit, 2000
CountryUnited States
CityLahaina, HI
Period6/12/006/14/00

Fingerprint

wakes
Vortex flow
vortices
Computer simulation
Light velocity
simulation
Doppler effect
Convergence of numerical methods
Message passing
acoustic sounding
velocity distribution
Program processors
Differential equations
Acoustics
numerical stability
carrier frequencies
messages
frequency shift
resources
differential equations

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Acoustics and Ultrasonics

Cite this

Boluriaan, S., & Morris, P. J. (2000). Parallel numerical simulation of wake vortex detection using rass. Paper presented at 6th Aeroacoustics Conference and Exhibit, 2000, Lahaina, HI, United States.
Boluriaan, Said ; Morris, Philip John. / Parallel numerical simulation of wake vortex detection using rass. Paper presented at 6th Aeroacoustics Conference and Exhibit, 2000, Lahaina, HI, United States.
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Boluriaan, S & Morris, PJ 2000, 'Parallel numerical simulation of wake vortex detection using rass' Paper presented at 6th Aeroacoustics Conference and Exhibit, 2000, Lahaina, HI, United States, 6/12/00 - 6/14/00, .

Parallel numerical simulation of wake vortex detection using rass. / Boluriaan, Said; Morris, Philip John.

2000. Paper presented at 6th Aeroacoustics Conference and Exhibit, 2000, Lahaina, HI, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Parallel numerical simulation of wake vortex detection using rass

AU - Boluriaan, Said

AU - Morris, Philip John

PY - 2000/12/1

Y1 - 2000/12/1

N2 - A parallel, two-dimensional Euler, one-dimensional Maxwell code is developed to numerically simulate wake vortex detection using a Radio Acoustic Sounding System (RASS). The code is written in Fortran 90 with the Message Passing Interface (MPI) for parallel implementation. The main difficulty with a time accurate simulation is the number of samples required to resolve the Doppler shift in the scattered electromagnetic signal. Even for a ID simulation with typical scatterer size, the CPU time required to run the code is far beyond currently available computer resources. Two alternatives that overcome this problem are described. In the first the code is run for a fictitious speed of light. Second, the governing differential equations are recast in order to remove the carrier frequency and solve only for the frequency shift using an implicit scheme with large time steps. The numerical stability characteristics of the resulting discretized equation with complex coefficients are shown. The code is run for both the approaches with Taylor and Oseen vortex velocity profiles. Finally, the Abel transform is applied to the outputs of both explicit and implicit schemes, and the wake vortex velocity field is retrieved with very good accuracy.

AB - A parallel, two-dimensional Euler, one-dimensional Maxwell code is developed to numerically simulate wake vortex detection using a Radio Acoustic Sounding System (RASS). The code is written in Fortran 90 with the Message Passing Interface (MPI) for parallel implementation. The main difficulty with a time accurate simulation is the number of samples required to resolve the Doppler shift in the scattered electromagnetic signal. Even for a ID simulation with typical scatterer size, the CPU time required to run the code is far beyond currently available computer resources. Two alternatives that overcome this problem are described. In the first the code is run for a fictitious speed of light. Second, the governing differential equations are recast in order to remove the carrier frequency and solve only for the frequency shift using an implicit scheme with large time steps. The numerical stability characteristics of the resulting discretized equation with complex coefficients are shown. The code is run for both the approaches with Taylor and Oseen vortex velocity profiles. Finally, the Abel transform is applied to the outputs of both explicit and implicit schemes, and the wake vortex velocity field is retrieved with very good accuracy.

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Boluriaan S, Morris PJ. Parallel numerical simulation of wake vortex detection using rass. 2000. Paper presented at 6th Aeroacoustics Conference and Exhibit, 2000, Lahaina, HI, United States.