EFD Validation Data

Experiment

Results from towing tank experiments for David Taylor Model Basin model 5512 are presented for resistance, sinkage and trim, wave profile, and nominal wake tests and uncertainty assessment. The resistance and sinkage and trim data are for Froude numbers 0.05-0.45 and free model condition. The wave profiles and nominal wake data are for Froude numbers 0.28 and 0.41 and fixed-model condition (at the dynamic sinkage and trim for each Fr). The test design, measurement systems, and uncertainty assessment are described. The uncertainty assessment methodology rigorously follows the AIAA Standard S-071-1995. The results are discussed with regard to the data trends and uncertainties, including Fr effects. Future work is mentioned. The data contributes to the surface-ship resistance and propulsion model-scale database for computational fluid dynamics validation, as part of an international collaborative project between Iowa Institute of Hydraulic Research, Istituto Nazionale per Studi ed Esperienze di Architettura Navale, and David Taylor Model Basin on experimental and computational fluid dynamics and uncertainty assessment for a combatant geometry.

Data, equipment, and conditions

Data	Equipment	Fr	Locations
Resistance	20 kg loadcell	0.05-0.45; DFr = 0.05	-
Sinkage and trim	Linear potentiometers	0.05-0.45; DFr = 0.05	-
Wave profiles	Markers	0.28, 0.41	x / L = 0-1; Dx / L = 0.02
Near field wave elevations	Servo-type wave gages	0.28	x / L = -0.2-1.3, y / L = 0-0.082
Far field wave elevations	Capacitance wires	0.28	x / L = -0.2-1.3, y / L = 0.082-0.39
Nominal wake flow field	2DPIV	0.28	x / L = 0.935, y / L = -0.05-0, z / L = -0.045-0

Sample image

Starboard bow flow for model 5512 at Fr = 0.28

Download 5512 geometry

Click on the image below to download an .iges file of the appended model 5415/5512

Sample data

Nominal wake U contours and VW vectors for Fr = 0.28

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References

Gui, L., Longo, J., and Stern, F., (2001), “Biases of PIV Measurement of Turbulent Flow and the Masked Correlation-Based Interrogation,” Experiments in Fluids, Vol. 30, pp. 27-35. (pdf)

Gui, L., Longo, J., and Stern, F., (2001), “Towing Tank PIV Measurement System, Data and Uncertainty Assessment for DTMB Model 5512,” Experiments in Fluids, Vol. 31, pp. 336-346. (pdf)

Longo, J. and Stern, F., (2005), "Uncertainty Assessment for Towing Tank Tests With Example for Surface Combatant DTMB Model 5415," J. Ship Research, Vol. 49, No. 1, pg. 55-68. (pdf)

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