Abstract
Numerical simulation of two-dimensional laminar unsteady flow past a right trapezoidal cylinder at low Reynolds number (Re = 100), zero of the flow approaching angle and sharpening angle of the right trapezoidal of 22.5° with a side ratio B/A = 1 are carried out to provide moreapplicable data for engineering design of barred tee in aspect of structural integrity. A finite volume method, non-uniform meshing with second-order implicit time discretization into eight-node quadratic quadrilateral finite elements is employed. An incompressible flow SIMPLEC code with constant fluid properties is used. The convective terms using a third-order QUICK scheme. The numerical simulation result is compared against the published results of flow past a square cylinder. The effect of sharpening angle on the response of the right trapezoidal cylinder is investigated. A special study of the effects of flow on significant factor for time step, grid independence, blockage ratio, domain size, upstream and downstream extents, size domain next to cylinder and size domain extent are performed systematically. The Strouhal number and RMS lift coefficients of fully saturated flow are calculated. The result shown that increasing of sharpening angle, the Strouhal number is negligible changed whilst the RMS lift coefficients significantly increased.
Highlights
In long piping or pipeline system normally used pigging for various internal activities such as separating fluids, cleaning and inspecting the pipeline
Sohankar et al [1] carried out numerical simulations of two dimensional unsteady flow around a square cylinder at zero approaching angle α = 0o, Re = 100 to study the influence of time step Δt, size domain next to cylinder ζ, grid size, extend of computation domain size Δ, upstream extends Xu and downstream extends Xd of the calculation domain, side wall height, respectively
These results indicated that with the decrease of time step the Strouhal number and RMS lift coefficient are increased
Summary
In long piping or pipeline system normally used pigging for various internal activities such as separating fluids, cleaning and inspecting the pipeline. Sohankar et al [1] carried out numerical simulations of two dimensional unsteady flow around a square cylinder at zero approaching angle α = 0o, Re = 100 to study the influence of time step Δt, size domain next to cylinder ζ, grid size, extend of computation domain size Δ, upstream extends Xu and downstream extends Xd of the calculation domain, side wall height, respectively. Numerical simulations are carried out to investigate Strouhal number, RMS lift coefficient, of a right trapezoidal cylinder in unsteady flow to provide further more applicable data for engineering design of barred tee in aspect of structural integrity. The origin of force coordinates is placed at the center of right trapezoidal cylinder geometry with drag and lift force positive in the D and L-direction, respectively
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