Journal of computational fluids engineering (한국전산유체공학회지)
- Volume 2 Issue 1
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- Pages.1-7
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- 1997
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- 1598-6071(pISSN)
Numerical calculation of Laminar flow in a Square Duct of 90° Bend
정사각형 단면을 갖는 90° 곡관의 층류유동 계산
Abstract
A FA-FD hybrid method, developed for solving three-dimensional incompressible Navier-Stokes equations, is applied to calculate three-dimensional laminar flows through a square duct with a 90° bend. The method discretizes the convective terms in the primary flow direction with 3rd-order upwind finite-differences and the convective and diffusive terms in the transverse directions with the two-dimensional finite analytic method. The non-staggered grid system is used and the pressure-velocity coupling is achieved by a global iteration procedure based on the PISO algorithm. Detailed comparisons between the computed solutions and the available experimental data are given mainly for the velocity distributions at cross-sections in a 90° bend of a square duct with both fully developed and developing entry flows. Although the computational result shows generally a good agreement with the experimental data, there are some significant discrepancies underlining the necessity of more accurate numerical methods as well as reliable experimental data for their validation.
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