Research On The Water Force Numerical Calculation Of Large Water Level Difference In The Mountainous Area’ River To The Structure Of Frame Pier Wharf

The water level of the Three Gorges Reservoir has experienced great changes afterthe electricity generation. Under the extreme circumstances of the reach such as theseasonal rainstorms, the upstream pier of the Three Gorges Reservoir is subjected to thespecial hydrological conditions test, namely the high water level and quick water flow,the pier is greatly influenced by the water flow. The frame pier is a new pier structurewith multiple links. The structure of the frame pier is complicatedly affected by water,and the water load cannot be accurately calculated at present. To have a preciseunderstanding of the influence water has on the structure of the frame pier, the authorset up two dimension and three dimension calculation models based on the FLUENTfluid calculation software, and carried out the simulating calculation of the two squarecolumn flow-around, multi-column flow–around, and three-dimensional flow-around.The present study aims to investigate the framework flow resistance coefficient of theframe pier in certain conditions and to analyze the flow field around. It is of greatsignificance in terms of clear calculation of the flow stress and structure optimization, aswell as the reduce of the cost of the project.Two-dimensional numerical simulation for: series parallel flow around two squarecolumn with single row, double row with three square column flow simulations.Series parallel flow around two square column with single row, double row withthree square column flow simulation. Simulation for flow around resistance coefficientis found that variation of square column spacing in tandem on downstream squarecolumn is strongly influenced by flow resistance, the upstream basic maintained at2.0square column resistance coefficient, and the friction coefficient of the single columnbasic equal. Downstream of the resistance coefficient of square column from-0.62andwith increasing spacing increases, because of the flow field changes of the negative,leading to square column differential pressure changes before and after the results.Parallel flow around two square column with three square column parametersappear certain symmetrical phenomenon, both for left and right sides of the squarecolumn in the pointed position; Tied for two square column spacing ratio of2,2.5,3when the drag coefficient were2.40,2.28,2.18, and with three square column spacingratio of1,2,3,4, when the two sides of the square resistance coefficient were3.63,2.69,2.35,2.69, and similarly, the resistance coefficients is increased when compared withsingle column. Double row with three square column simulation flow around square columnresistance coefficient is obtained mainly in the range of1.65~3.63, the resistancecoefficient of each square column had no obvious change rule.Three-dimensional single spreader, double cross arm of two tied for the flowaround square column simulation of contact with a layer of transverse and longitudinalsupport double row and four square column flow simulation. Simulation and found: forgeneral engineering situations, under a certain spacing wharf on the lower level of crossarm in the water under the action of mutual influence is small, lateral brace itselfresistance coefficient is2.0, same as for the double row when contact with transverseand longitudinal support four square column flow, water flow downstream cross armsuffered resistance decreased obviously, the drag coefficient has been reduced to0.5,while the vertical water flow resistance is almost negligible.String tied for the pile spacing changes on the rear of the flow field changeobviously, under the premise that to a certain flow velocity, spacing factor as the mainfactors influencing the flow field flow around pile.