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- W2495359946 abstract "A portion of the upper-deck surface of a submarine can be coated with roughness for crew safety when walking on the hull. The roughness factor for the nonskid coating on a full-scale submarine is very large, on the order of 400 under typical ship operation conditions. Boundary layer development, flow separation, cross-flow drag, hull surface pressure, and ship motion may be modified by the presence of this coating during turning maneuvers. Free-running model (FRM) submarines are routinely employed by the Naval Surface Warfare Center to characterize submarine maneuvering behavior, and the application of an appropriately sized nonskid coating to the model is required for fidelity of model maneuvering experiments. Three methods to scale the coating have been investigated, and conventional geometric scaling and wall shear velocity scaling methods were found to be inadequate. A new scaling method termed the momentum boundary layer thickness (MBLT) method has been developed. This method relates the cross-flow drag on the FRM with that on the full-scale vehicle. Boundary layer velocity profiles on an axisymmetric body at model and full-scale Reynolds numbers have been computed by a RANS code. Velocity profiles encountered by the full-scale nonskid coating are found to match well with those developed on the FRM with roughness sized using the MBLT method. The scaled roughness size compares favorably with two empirically determined roughness sizes that have been previously used on FRMs that have shown good correlation with full-scale maneuvering data." @default.
- W2495359946 created "2016-08-23" @default.
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- W2495359946 date "2011-03-01" @default.
- W2495359946 modified "2023-09-25" @default.
- W2495359946 title "A Method to Scale the Roughness of Submarine Nonskid Coatings on a Free-Running Model for Maneuvering Experiments" @default.
- W2495359946 doi "https://doi.org/10.5957/jsr.2011.55.1.64" @default.
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