Index of /turbdata/agard/chapter8/CMP10

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[   ]cmp10d01.dat 2011-06-20 13:46 422K 
[   ]cmp10d02.dat 2011-06-20 13:46 422K 
[   ]cmp10d03.dat 2011-06-20 13:46 422K 
[   ]cmp10d04.dat 2011-06-20 13:46 422K 
[   ]cmp10d05.dat 2011-06-20 13:46 422K 
[   ]cmp10d06.dat 2011-06-20 13:46 422K 
[   ]cmp10d07.dat 2011-06-20 13:46 422K 
[   ]cmp10d08.dat 2011-06-20 13:46 422K 
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[   ]cmp10d10.dat 2011-06-20 13:46 422K 
[   ]cmp10d11.dat 2011-06-20 13:46 422K 
[   ]cmp10d12.dat 2011-06-20 13:46 422K 
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[   ]cmp10d16.dat 2011-06-20 13:46 422K 
[   ]cmp10d17.dat 2011-06-20 13:46 422K 
[   ]cmp10d18.dat 2011-06-20 13:46 5.9K 

1.  FLOW TITLE:  Case CMP10;  Cantwell, B. J. And Coles, D.,                     
    "A Flying Hot Wire Study Of The Turbulent Near Wake Of A                    
    Circular Cylinder At A Reynolds Number Of 140000"                           
                                                                                
2.  REVISION DATE:  November 18, 1980                                           
                                                                                
3.  EVALUATOR:  Cantwell, B. J., Department Of Aeronautics And        
    Astronautics, 371 Durand, Stanford University, Stanford, Ca. 94305.         
                                                                                
4.  EXPERIMENT LOCATION AND DATE                                                
         Graduate Aeronautical Laboratory Of California Institute Of            
    Technology(Galcit) 10 Foot Tunnel, October 1975.                            
                                                                                
5.  ABSTRACT OF EXPERIMENT                                                      
         Measurements were made in the near wake of a circular cylinder at a    
    reynolds number of 140000, to study the phenomenology of the processes      
    of vortex formation and transport. The reynolds number was high enough      
    to cause a fully turbulent wake but low enough to insure laminar            
    separation. X-array hot wire probes mounted on the ends of a pair of        
    whirling arms were used for the measurements. By applying a large enough    
    velocity to the wires, the relative flow angle was maintained within the    
    +/- 30 degree range of sensitivity of x-array so that, the usual velocity   
    rectification problem was avoided. The data acquisition system was computer 
    controlled. A signal synchronized with the vortex shedding process  and     
    recorded along with hot wire data was used to sort data into populations    
     with the same phase. Ensemble averages conditioned in this way yield       
    an average picture of the instantaneous flow field in which the vortices    
    are frozen as in a photograph. The processed data are specified on a        
    grid which covers -0.5<=x/d<=8.0 and -3.0<=y/d<=3.0 with grid lines         
    spaced 0.1*d apart in both directions.                           
                                                                                
6.  REFERENCES                                                                  
         (1)  Cantwell, B. J., "A Flying Hot Wire Study Of The Turbulent Near   
              Wake Of A Circular Cylinder At A Reynolds Number Of 140000",      
              Ph.D. Thesis, California Institute Of Technology, 1976.           
         (2)  Coles, D., Cantwell, B. J. And Wadcock, A. J., "The Flying Hot    
              Wire And Related Instrumentation", Nasa Contractor Report 3066,   
              1978.                                                             
                                                                                
7.  INSTRUMENTATION                                                             
         Velocity: modified DISA55a38 x-array hot wire probes                  
         Pressure: Barocel electronic manometers                                
         Temperature: electronic thermometer (National model no. LX5606)        
         Data acquisition: a 16 channel Preston analog to digital converter     
          with a resolution of 14 bits plus sign( maximum conversion rate       
          500000 words/second on 1 channel); a HP2100 minicomputer with a       
          disk operating system and 32k words of core; digital tape recording   
          of edited data.                                                       
                                                                                
8.  GLOBAL PARAMETERS                                                           
         1.  Cylinder diameter, Lref(or d) =10.137 cm                           
         3.  Dynamic pressure for wake data runs, Qref = 1.955 mmhg             
         4.  Free-stream speed, Uref = 2120 +/- 10 cm/sec                       
         6.  Free-stream temperature, Tref= 24 +/- 2 degree Celsius             
         7.  Kinematic viscosity, nu = 0.1535 cm**2/sec                        
         8.  Reynolds number, Re = Uref*D/nu = 140000                          
         9.  Free-stream turbulence level, <=0.006                              
         10. Drag coefficient, Cd = 1.227                                       
         11. Base pressure coefficient, Cpb = -1.21                             
         12. Shedding period = 26.65 millisec                                   
         13. Strouhal number = 0.179                                            
                                                                                
9.  MEASURED VARIABLES                                                          
         U/Uref, V/Uref, U2/Uref2, V2/Uref2,                                    
         U1V1/Uref2, U3/Uref3, V3/Uref3, U4/Uref4,                              
         V4/Uref4, U2V1/Uref3, U1V2/Uref3 AND GAMMA(Intermittency)              
                                                                                
10. MEASUREMENT UNCERTAINTY                                                     
         None specified.                                                        
                                                                                
11. FILE ORGANIZATION                                                           
Files CMP10d01.dat to CMP10d17.dat are data at phases
    1 to 17.  Phase 17 is a population weighted average of other phases.                               
    Organization of records within each of these data files is                  
    as follows:                                                                 
                                                                                
    RECORD                 VARIABLES                         FORMAT             
                                                                                
    1    MAXIMA OF U/UREF,V/UREF,U2/UREF2,V2/UREF2          4E20.7              
    2    MAXIMA OF U1V1/UREF2,U3/UREF3,V3/UREF3,U4/UREF4    4E20.7              
    3    MAXIMA OF V4/UREF4,U2V1/UREF3,U1V2/UREF3,GAMMA     4E20.7              
                                                                                
    4    MINIMA OF U/UREF,V/UREF,U2/UREF2,V2/UREF2          4E20.7              
    5    MINIMA OF U1V1/UREF2,U3/UREF3,V3/UREF3,U4/UREF4    4E20.7              
    6    MINIMA OF V4/UREF4,U2V1/UREF3,U1V2/UREF3,GAMMA     4E20.7              
                                                                                
    7    Y indices specifying range of actual data                              
         boundary in upper half of grid in fig.1                                
         for X index = 1(X/D=-0.5)                           2I6                
    8    Y indices ... For X index= 2(X/D=-0.4)              2I6                
   ...                     ...                          ...                     
    92   Y indices ... For X index=86(X/D= 8.0)              2I6                
                                                                                
    93      Normalized and integerized                                       
               U/UREF,V/UREF,U2/UREF2,                                          
               V2/UREF2,U1V1/UREF2,U3/UREF3,                                    
               V3/UREF3,U4/UREF4,V4/UREF4,                                      
               U2V1/UREF3,U1V2/UREF3,                                           
               GAMMA (intermittency) at grid point                              
               with X index=1 and Y index=1                  12I6               
    94         Norm... X index=1 and Y index=2               12I6               
    ...                       ...                             ...               
    5338       Norm... X index=86 and Y index=61             12I6               
                                                                                
    variables in records 93-5338 are normalized as follows:                     
                                                                                
    XNORM = (X-XMIN)/(XMAX-XMIN)                                                
                                                                                
    Normalized variables are made into integers by multiplying                  
    by 10000 and rounding to the nearest integer.                               
                                                                                
    IXNORM = XNORM*10000                                                        
                                                                                
    Thus each number in records 93-5338 is an integer in the range 0 to 10000.  
    All null data are written as 20000.                                         
    The equation describing the relation between actual data and                
    the normalized data on tape is:                                             
                                                                                
    X=((XMAX-XMIN)*IXNORM)/10000.+XMIN                                          
                                                                                
    WHERE X, XMAX AND XMIN ARE REAL AND IXNORM IS INTEGER.                      
                                                                                
    The data are given at each of the points of the rectangular                 
    grid enclosing the actual data boundary shown in fig. 1.                    
    The order of the points is determined by the y index                        
    varying most rapidly and the x index varying least rapidly(similar          
    to fortran array storage convention).                                       
                                                                                
    File CMP10d18.dat is the pressure distribution around
    360 degrees of the cylinder surface. The cylinder angle alpha is measured
    in degrees. Alpha = 0 degree corresponds to the forward stagnation
    point. Records within this file are organized as follows:                      
                                                                                
    RECORD                 VARIABLE                         FORMAT              
                                                                                
    1          ALPHAMAX,ALPHAMIN,CPMAX,CPMIN                4E20.7              
    2-74       Normalized and integerized Alpha,Cp          2I6                 
                                                                                
    Variables in records 2-74 are normalized and integerized as                 
    in files 1 - 17.