# Mathematical Description of Turbulent Flows

*The mathematical description of uniform density and thermally stratified flows in terms of space averages is reviewed. The governing equations are presented and the use of alternative...*

Calculation of Secondary Currents in Channel Flow

*A model is presented for calculating the flow in channels with turbulence-driven secondary motion, with an emphasis on open channel flow. Algebraic expressions are derived for the Reynolds...*

Separation Angle Effect on Vortex Shedding Frequency

*Vortex shedding frequencies were measured for a number of two-dimensional bluff bodies whose boundary layers separation angles ranged from 0°-90° to the oncoming flow. Strouhal numbers...*

Vertical Turbulent Diffusion in Air-Driven Water Flows

*Turbulence intensities and Reynolds stresses produced in a water channel by an air flow over the surface have been measured. An expression for the vertical eddy diffusion coefficient is...*

Bed Material Sorting in Pools and Riffles

*When rivers flow in a series of riffles and pools during periods of low flow, bed material sizes change from coarser to finer in the riffle-pool sequence. The Froude Number also changes...*

Antecedent Moisture Condition Probabilities

*The problem of selecting an appropriately conservative Antecedent Moisture Condition (AMC) when using the Soil Conservation Service curve number method or the Illinois Urban program for...*

Unstable Turbulent Flow in Open Channels

*Controversy on the determination of the friction factor, f, for turbulent flow in open channels of rectangular cross section has existed among previous investigators. A number of them...*

Separated Flow Through Large Sudden Expansions

*Flow patterns for large, sudden expansions have been obtained experimentally. The experimental studies reveal that flow patterns for large expansions are highly asymmetric and unsteady....*

Minimum Specific Energy in Compound Open Channel

*A compound-channel Froude number is derived to reflect correctly the occurrence of minimum specific energy in open channels with overbank flow. The limitations of conventional Froude-number...*

Forces Acting on Floc and Strength of Floc

*A theoretical and experimental investigation was attempted to determine floc strength quantitatively. Some formulas were presented to evaluate the hydrodynamical forces acting on a suspended...*

Streamwise Oscillations of Cylinders

*Slender structures, such as marine piles, have been observed to experience oscillations in a streamwise direction when exposed to an external flow under appropriate circumstances. This...*

Parametric Study of Flood Wave Propagation

*A parametric study of the flood wave propagation problem is made, based on numerical solution of the nondimensionalized unsteady flow equations of open channels. The propagation of a sinusoidal...*

Pressure Scale Effects on Shape Drag in Conduit

*While testing cylinders in closed conduit flow, it was found that the drag coefficient varied with pressure at a constant Reynolds number. The conditions at which this phenomenon occurs...*

Cavitation Induced by Turbulence in Stilling Basin

*It is shown by simple arguments that is stilling basins, intense turbulence of flows could produce conditions favorable to cavitation. A free hydraulic jump occurring in a stilling basin...*

Curve-Number Procedure as Infiltration Method

*The soil conservation Service (SCS) curve-number procedure is commonly used to determine rainfall excess. The advantage of this method is that the parameters in the relation are the soil...*

Hydraulic Design of Flow Distribution Channels

*A method to analyze flow distribution over side weirs in a flow distribution channel has been presented. It is found that the discharge coefficient for individual side weirs is not constant...*

Runoff Synthesis Using Landsat and SCS Model

*The land cover requirements of the Soil Conservation Service (SCS) model used to develop volume of runoff for hydrograph synthesis in suburban areas were modified to be compatible with...*

Drag of Yawed Pile Groups at Low Reynolds Numbers

*The hydrodynamic drag on square arrays of model cylindrical piles in the Reynolds number range of 250 to 750 is shown to be a function of the angle of yaw of the incident flow and is also...*

Experiments on Arrested Saline Wedge

*Experimental results are presented which show that the onset of interfacial wave breaking can be expressed by a stability parameter which is a function of the interfacial densimetric Froude...*

Force on Sill of Forced Jump

*The mean force on a continuous sill in a forced hydraulic jump has been measured directly by a transducer for a wide range of experimental conditions. Four sills of heights expressed as...*

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