25 May 1994 Thank you for your interest in the Rearward-facing step flow data of Srba Jovic and myself. The data is presented for you in IBM compatible floppy disk format so as to be compatible with the largest possible user base. Undoubtedly the IBM format will be obsolete in future years, but it is our hope that during the next 5 or 10 years that this will be a convenient way of transmitting data to our friends. Extracting data from figures in reports is difficult at best, and inevitably results in errors. Hopefully, the availability of this data base will obviate the need for this practice. The tables that follow are an exact replica of those that appear in NASA Technical Memorandum 108807, authored by Jovic and Driver, dated February 1994. The tables contain Cp, Cf, U,V,uu,vv, and -uv The files can be printed on your printer, since they are in ASCII. The flow is described in the following publications, Jovic, S. and Driver, D., "Backward-Facing Step Measurements at Low Reynolds Number, Re_h=5000," NASA TM 108807, February 1994. Jovic, S. and Driver, D., "Reynolds Number Effect on the Skin Friction in Separated Flows Behind a Backward-Facing Step," Experiments in Fluids, Vol 18, No 6, April 1995, pp 464-467. Any use of the above data base should be referenced to these publications. If you have any questions on the data base please do not hesitate to contact. Dave Driver e-mail driver@sunrfe.arc.nasa.gov NASA Ames Research Cntr M/S 229-1 Moffett Field, CA 94035-1000 or Srba Jovic e-mail hilandar@clubmed.arc.nasa.gov NASA Ames Research Cntr M/S 247-2 Moffett Field, CA 94035-1000 Good luck with turbulence modeling and computing. Sincerely, Dave Driver ___GEOMETRY___ X_r/h=6 ..v. ._____________________v_________________________ ______________________h__! ^ ^ | ---> | | U_o=7.72m/s 10 h 12 h | | ______________________V__. | h=9.8mm !_______________________________V_______________ ^ . ^ x=0 X_r/h=6 Tunnel Width (Aspect ratio) = 31 h ____FLOW CONDITIONS____ U_o=7.72m/s h=9.8mm Re_h=5000 X_r/h=6.0 Incoming BL: del_star=1.73mm, Theta=1.19mm, del=11.5mm Reference Wall static Pressure is measured at x/h=-5.1 Reference velocity U_o is measured at x/h=-3.05 ____DATA TABLES_____ Table 1: Integral parameters i x/h Ue(m/s) d*(mm) th(mm) D(mm) H Reth Cflt G 1 -3.000 7.72 1.73 1.19 11.5 1.45 610 4.90E-03 6.24 2 4.000 7.41 10.47 1.96 22.0 5.33 970 -2.72E-03 N/A 3 6.000 7.12 8.41 2.98 21.0 2.82 1416 0.00E 00 N/A 4 10.000 6.97 6.53 3.46 22.5 1.89 1608 2.35E-03 13.71 5 15.000 6.75 5.95 3.52 24.0 1.69 1585 2.83E-03 10.85 6 19.000 6.95 5.80 3.56 24.0 1.63 1651 3.00E-03 9.97 Table 2: C_f measurements x/h Cf 3.0 -0.00207 3.33 -0.00336 3.50 -0.00321 3.58 -0.00268 4.17 -0.00218 5.17 -0.00103 7.08 0.00113 7.08 0.00150 8.00 0.00136 8.50 0.00154 10.0 0.00237 10.33 0.00198 12.17 0.00244 15.00 0.00292 15.00 0.00325 15.17 0.00297 19.00 0.0030 20.00 0.0031 Table 3: Pressure coefficient along the Bottom Wall of the tunnel Bottom wall: Reference pressure at x/h=-5.2 #pt x/h Cp 1 0.0 -0.0340 2 0.5 -0.0360 3 1.0 -0.0380 4 1.5 -0.0392 5 2.0 -0.0437 6 2.5 -0.0471 7 3.0 -0.0357 8 3.5 -0.0038 9 4.0 0.0357 10 4.5 0.0715 11 5.0 0.1046 12 5.5 0.1331 13 6.0 0.1521 14 6.5 0.1681 15 7.0 0.1798 16 7.5 0.1871 17 8.0 0.1966 18 8.5 0.2008 19 9.0 0.2046 20 9.5 0.2053 21 10.0 0.2053 22 10.5 0.2103 23 11.0 0.2087 24 12.0 0.2091 25 14.0 0.2160 26 16.0 0.2148 27 20.0 0.2118 28 24.0 0.2148 29 28.0 0.2160 30 32.0 0.2160 Table 4: Pressure coefficient along the Top Wall of the tunnel Top wall: Reference pressure at x/h=-5.2 #pt x/h Cp 1 0.083 -0.0335 2 0.333 -0.0323 3 0.875 -0.0354 4 1.375 -0.0346 5 1.875 -0.0426 6 2.375 -0.0464 7 3.000 -0.0380 8 3.500 -0.0057 9 4.000 0.0312 10 4.500 0.0722 11 5.333 0.1217 12 5.917 0.1445 13 6.333 0.1635 14 6.833 0.1749 15 7.333 0.1863 16 7.750 0.1932 17 8.333 0.1977 18 8.917 0.2110 19 9.833 0.2065 20 10.75 0.2095 21 11.25 0.2114 22 12.00 0.2137 23 13.33 0.2122 24 14.667 0.2152 25 16.00 0.2148 26 18.667 0.2148 27 21.333 0.2179 28 32.00 0.2186 Table 5: Measurements at x/h=-3.12 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.25 1.91 0.00 0.711 0.008 0.027 0.49 3.49 0.00 1.232 0.019 0.078 0.97 4.83 -0.01 1.003 0.055 0.115 1.94 5.61 0.00 0.563 0.093 0.106 3.88 6.36 0.01 0.341 0.101 0.096 5.82 6.79 0.04 0.260 0.083 0.070 7.76 7.24 0.04 0.179 0.056 0.042 9.70 7.46 0.08 0.105 0.044 0.022 11.64 7.66 0.07 0.031 0.024 0.006 13.58 7.71 0.06 0.011 0.013 0.000 15.52 7.72 0.06 0.008 0.010 -0.001 17.46 7.71 0.04 0.007 0.010 -0.001 19.40 7.69 0.03 0.012 0.010 0.000 21.34 7.68 0.04 0.012 0.009 -0.001 24.25 7.68 0.06 0.006 0.008 0.000 29.10 7.71 0.02 0.006 0.009 0.000 28.80 7.70 -0.01 0.007 0.008 0.000 Table 6: Measurements at x/h= 4.0 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.25 -0.59 0.02 0.236 0.019 -0.001 0.97 -1.06 -0.04 0.481 0.124 0.041 1.94 -0.92 -0.09 0.658 0.323 0.162 3.88 -0.18 -0.22 1.189 0.615 0.418 5.82 1.02 -0.43 1.755 0.794 0.620 7.76 2.60 -0.49 1.766 0.717 0.582 9.70 4.00 -0.51 1.389 0.556 0.433 11.64 5.19 -0.44 0.820 0.306 0.230 13.58 6.03 -0.39 0.387 0.144 0.091 15.52 6.50 -0.36 0.221 0.089 0.053 17.46 6.84 -0.32 0.171 0.059 0.032 19.40 7.07 -0.29 0.102 0.042 0.018 21.34 7.27 -0.25 0.053 0.026 0.007 24.25 7.38 -0.21 0.017 0.014 0.001 29.10 7.36 -0.16 0.011 0.011 0.000 28.80 7.41 -0.09 0.009 0.007 0.001 Table 7: Measurements at x/h= 6.0 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.25 0.08 -0.08 0.218 0.127 0.050 0.49 0.16 -0.08 0.356 0.199 0.099 0.97 0.26 -0.12 0.452 0.306 0.158 1.94 0.72 -0.20 0.862 0.572 0.377 3.88 1.49 -0.33 1.464 0.737 0.603 5.82 2.55 -0.47 1.823 0.724 0.647 7.76 3.64 -0.53 1.635 0.566 0.495 9.70 4.51 -0.45 1.511 0.367 0.299 11.64 5.40 -0.39 0.556 0.258 0.195 13.58 5.94 -0.37 0.296 0.147 0.092 15.52 6.33 -0.34 0.185 0.087 0.047 17.46 6.65 -0.31 0.105 0.050 0.027 19.40 6.83 -0.28 0.070 0.034 0.014 21.34 6.98 -0.26 0.031 0.024 0.008 24.25 7.07 -0.23 0.012 0.010 0.001 29.10 7.11 -0.19 0.009 0.005 0.001 38.80 7.17 -0.15 0.009 0.005 0.001 Table 8: Measurements at x/h= 10.0 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.25 1.07 -0.01 0.658 0.027 0.059 0.49 1.46 -0.04 0.968 0.076 0.132 0.97 2.11 -0.08 0.875 0.190 0.178 1.94 2.52 -0.13 0.840 0.356 0.240 3.88 3.04 -0.21 0.939 0.495 0.322 5.82 3.64 -0.26 1.114 0.507 0.392 7.76 4.24 -0.30 1.013 0.471 0.344 9.70 4.80 -0.21 0.850 0.388 0.304 11.64 5.44 -0.21 0.555 0.258 0.183 13.58 5.89 -0.12 0.418 0.189 0.130 15.52 6.23 -0.09 0.287 0.140 0.095 17.46 6.53 -0.06 0.145 0.085 0.050 19.40 6.74 -0.06 0.088 0.049 0.014 21.34 6.81 -0.07 0.070 0.041 0.015 24.25 6.89 -0.06 0.045 0.015 0.002 29.10 6.96 -0.10 0.020 0.006 0.000 38.80 6.99 -0.08 0.026 0.005 0.000 Table 9: Measurements at x/h= 15.0 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.20 1.12 0.00 0.528 0.017 0.029 0.44 1.93 0.00 0.857 0.026 0.057 0.92 2.70 -0.01 0.813 0.081 0.090 1.89 3.13 -0.04 0.693 0.185 0.103 3.83 3.51 -0.07 0.800 0.286 0.188 5.77 3.91 -0.13 1.009 0.322 0.233 7.71 4.24 -0.11 1.328 0.345 0.237 9.65 4.80 -0.13 1.149 0.289 0.251 11.59 5.32 -0.12 0.779 0.258 0.219 13.53 5.67 -0.09 0.674 0.190 0.154 15.47 5.98 -0.05 0.597 0.142 0.100 17.41 6.28 -0.01 0.350 0.087 0.049 19.35 6.48 0.03 0.258 0.069 0.025 21.29 6.61 0.05 0.171 0.040 0.012 24.20 6.71 0.06 0.047 0.022 0.001 29.05 6.72 0.06 0.062 0.013 0.001 38.75 6.77 0.04 0.085 0.009 0.002 Table 10: Measurements at x/h= 19.0 y U V uu vv -uv (mm) (m/s) (m/s) _____(m^2/s^2)____ 0.20 1.08 0.01 0.403 0.015 0.019 0.44 2.02 0.00 0.765 0.018 0.051 0.92 2.98 0.00 0.735 0.054 0.087 1.89 3.54 -0.01 0.565 0.130 0.094 3.83 3.90 -0.01 0.585 0.223 0.144 5.77 4.21 -0.02 0.606 0.245 0.160 7.71 4.53 -0.06 0.763 0.265 0.230 9.65 4.94 -0.07 0.745 0.292 0.243 11.59 5.35 -0.05 0.616 0.239 0.175 13.53 5.66 -0.03 0.595 0.197 0.167 15.47 6.03 -0.02 0.495 0.159 0.130 17.41 6.41 0.02 0.297 0.108 0.084 19.35 6.65 0.02 0.198 0.079 0.049 21.29 6.82 0.06 0.069 0.047 0.011 24.20 6.92 0.09 0.040 0.033 0.006 29.05 6.94 0.11 0.022 0.014 0.001 38.75 6.97 0.09 0.015 0.008 0.000