FIV in a tube bank with P/D=1.26 and square arrangement

Data result from careful measurements with hot wires and accelerometers in an aerodynamic channel to study the phenomenon of fluid-elastic instability in a square arrangement tube bank with all fixed tubes and with one cylinder free to vibrate. The tube bank was made from 25 mm diameter commercial PVC cylinders with five rows and five lines, P/D=1.26, and half tubes on the walls. The aerodynamic channel was made of acrylic, with a cross section of 0.146 m x 0.193 m. Flow velocity from 0 to 15 m/s, turbulence intensity about 1%. The gap velocity and the cylinder diameter, defined the reduced velocity Vr, with the natural frequency of the cylinder. Reynolds number ranged from Re = 1.8×10^4 to Re = 5.47×10^4, defined with the gap velocity and the cylinder diameter. ADXL335 accelerometers with a range of ±3g and resonant frequency of 5.5 kHz were fixed at the upper and lower ends of the cylinder free to vibrate. DANTEC StreamLine hot wire anemometer with two single wire probes (55P11) was used for velocity measurement. Data acquisition was made with a 16-bit A/D-board (NI 9215-A) with a USB interface using DANTEC StreamWare 3.4 software. The sampling frequency was 1000 Hz and a low pass filter was set at 300 Hz. Each data series has 2^16 elements, corresponding to 65.536s. Data are in .txt format to be read by almost all software. Case 1 - Time series of velocity signals (m/s) for a single Reynolds number Re=5.47x10^4. Fixed Tube bank with one hot wire probe on each side of the central cylinder. No accelerometer used. Case 2 - Time series of velocity signals (m/s) and acceleration (m/s^2) for a given reduced velocity Vr and Reynolds number Re. Central cylinder free to vibrate with one hot wire at each side. Case 3 - Time series of velocity signals (m/s) and acceleration (m/s^2) for a given reduced velocity Vr and Reynolds number Re. Central cylinder free to vibrate with both hot wires in the same gap at one side of the central cylinder. Case1 _Re_5.47x104.txt Case 2_Vr28_Re_1.8x104.txt Case2_Vr34_Re_2.01x104.txt Case2_Vr35_Re_2.17x104.txt Case2_Vr37_Re_2.3x104.txt Case2_Vr38_Re_2.4x104.txt Case2_Vr40_Re_2.499x104.txt Case2_Vr42_Re_2.626x104.txt Case2_Vr49_Re_3.08x104.txt Case2_Vr58_Re_3.65x104.txt Case2_Vr66_Re_4.18x104.txt Case3_Vr27_Re_1.73x104.txt Case3_Vr31_Re_2.58x104.txt Case3_Vr34_Re_2.17x104.txt Case3_Vr36_Re_2.3x104.txt Case3_Vr39_Re_2.4x104.txt Case3_Vr49_Re_3.08x104.txt Case3_Vr55_Re_3.51x104.txt