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{{AC|front=AC 1-01|description=Description_AC1-01|testdata=Test Data_AC1-01|cfdsimulations=CFD Simulations_AC1-01|evaluation=Evaluation_AC1-01|qualityreview=Quality Review_AC1-01|bestpractice=Best Practice Advice_AC1-01|relatedUFRs=Related UFRs_AC1-01}}
=Aero-acoustic cavity=
=Aero-acoustic cavity=


'''Application Challenge 1-01'''               © copyright ERCOFTAC 2004
'''Application Challenge 1-01'''                           © copyright ERCOFTAC 2004




=='''Overview of Tests'''==
=='''Overview of Tests'''==


The experimental conditions are described in TR-026-20.pdf. The full range of tests covers a variety of free-stream Mach numbers between 0.4 and 1.35, and for two cavity configurations, so-called shallow and deep. We concentrate here on a single one of these, namely M=0.85 deep cavity.
The experimental conditions are described in [[Media:TR-026-20.pdf|TR-026-20.pdf]]. The full range of tests covers a variety of free-stream Mach numbers between 0.4 and 1.35, and for two cavity configurations, so-called shallow and deep. We concentrate here on a single one of these, namely '''M=0.85 deep cavity'''.


Unsteady pressure measurements were recorded by 10 Kulite transducers along the centreline of the rig (which did not coincide with the centreline of the cavity itself), at a sampling rate of 6000Hz. The position of each transducer is given in Table 1.
Unsteady pressure measurements were recorded by 10 Kulite transducers along the centreline of the rig (which did not coincide with the centreline of the cavity itself), at a sampling rate of 6000Hz. The position of each transducer is given in Table 1.




Transducer Number


Distance X from leading edge of cavity
{| border = "1" align="center"
|+ align="bottom" | Table 1 Kulite Transducer Positions
!width="50"|Transducer Number
!width="200"|Distance X from leading edge of cavity (mm)
|-
|align="center"|1||align="center"|25.4
|-
|align="center"|2||align="center"|76.2
|-
|align="center"|3||align="center"|127.0
|-
|align="center"|4||align="center"|177.8
|-
|align="center"|5||align="center"|228.6
|-
|align="center"|6||align="center"|279.4
|-
|align="center"|7||align="center"|330.2
|-
|align="center"|8||align="center"|381.0
|-
|align="center"|9||align="center"|431.8
|-
|align="center"|10||align="center"|482.6
|}


(mm)
[{{filepath:AC1-01_M219D085.dat}} M219D085.dat] for the 10 transducer locations are stored using a sampling frequency of 6000 per second, for a total duration of just over 3.4 seconds. The [{{filepath:AC1-01_M219DRMS.dat}} M219DRMS.dat] at these locations are also presented.


1
There is no independent verification of the validity/accuracy of the experimental data.
 
25.4
 
2
 
76.2
 
3
 
127.0
 
4
 
177.8
 
5
 
228.6
 
6
 
279.4
 
7
 
330.2
 
8
 
381.0
 
9
 
431.8
 
10
 
482.6
 
 
Table 1. Kulite Transducer Positions
 
 
M219D085.dat for the 10 transducer locations are stored using a sampling frequency of 6000 per second, for a total duration of just over 3.4 seconds. The M219DRMS.dat at these locations are also presented.


There is no independent verification of the validity/accuracy of the experimental data.
=='''Test Conditions'''==
© ERCOFTAC 2004
Test Conditions


Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open (TR-026-20.pdf reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided.
Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open ([[Media:TR-026-20.pdf]] reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided.


The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows:
The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows:
Line 89: Line 54:
Re = 6.84e6 (based on cavity length of 0.508m)
Re = 6.84e6 (based on cavity length of 0.508m)


P0 = 99612.06 Pa
P<sub>0</sub> = 99612.06 Pa


P = 62059.14 Pa
P = 62059.14 Pa


T0 = 305.06 K
T<sub>0</sub> = 305.06 K


Incidence = 0o
Incidence = 0o
© ERCOFTAC 2004
References


TR-026-20.pdf Henshaw M.J de C., “M219 Cavity case in Verification and Validation Data for Computational Unsteady Aerodynamics”, RTO-TR-26, AC/323(AVT)TP/19, October 2000
=='''References'''==
 
[[Media:TR-026-20.pdf|TR-026-20.pdf]] Henshaw M.J de C., “''M219 Cavity'' case in Verification and Validation Data for Computational Unsteady Aerodynamics”, RTO-TR-26, AC/323(AVT)TP/19, October 2000
 
© copyright ERCOFTAC 2004
© copyright ERCOFTAC 2004
----


Contributors: Fred Mendonca; Richard Allen - Computational Dynamics Ltd
Contributors: Fred Mendonca; Richard Allen - Computational Dynamics Ltd


Site Design and Implementation: Atkins and UniS
Site Design and Implementation: [[Atkins]] and [[UniS]]
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{{AC|front=AC 1-01|description=Description_AC1-01|testdata=Test Data_AC1-01|cfdsimulations=CFD Simulations_AC1-01|evaluation=Evaluation_AC1-01|qualityreview=Quality Review_AC1-01|bestpractice=Best Practice Advice_AC1-01|relatedUFRs=Related UFRs_AC1-01}}

Latest revision as of 14:40, 11 February 2017

Front Page

Description

Test Data

CFD Simulations

Evaluation

Best Practice Advice

Aero-acoustic cavity

Application Challenge 1-01 © copyright ERCOFTAC 2004


Overview of Tests

The experimental conditions are described in TR-026-20.pdf. The full range of tests covers a variety of free-stream Mach numbers between 0.4 and 1.35, and for two cavity configurations, so-called shallow and deep. We concentrate here on a single one of these, namely M=0.85 deep cavity.

Unsteady pressure measurements were recorded by 10 Kulite transducers along the centreline of the rig (which did not coincide with the centreline of the cavity itself), at a sampling rate of 6000Hz. The position of each transducer is given in Table 1.


Table 1 Kulite Transducer Positions
Transducer Number Distance X from leading edge of cavity (mm)
1 25.4
2 76.2
3 127.0
4 177.8
5 228.6
6 279.4
7 330.2
8 381.0
9 431.8
10 482.6

M219D085.dat for the 10 transducer locations are stored using a sampling frequency of 6000 per second, for a total duration of just over 3.4 seconds. The M219DRMS.dat at these locations are also presented.

There is no independent verification of the validity/accuracy of the experimental data.

Test Conditions

Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open (Media:TR-026-20.pdf reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided.

The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows:

M = 0.85

Re = 6.84e6 (based on cavity length of 0.508m)

P0 = 99612.06 Pa

P = 62059.14 Pa

T0 = 305.06 K

Incidence = 0o

References

TR-026-20.pdf Henshaw M.J de C., “M219 Cavity case in Verification and Validation Data for Computational Unsteady Aerodynamics”, RTO-TR-26, AC/323(AVT)TP/19, October 2000

© copyright ERCOFTAC 2004


Contributors: Fred Mendonca; Richard Allen - Computational Dynamics Ltd

Site Design and Implementation: Atkins and UniS


Front Page

Description

Test Data

CFD Simulations

Evaluation

Best Practice Advice