Mud Handling System 수송라인 내 혼상류 시뮬레이션을 위한 수치해법 개발

Abstract

In the drilling processes and regarding systems, multiphase flows, where gas, water, oil and discrete solid materials are mixed, frequently and easily observed. To increase the performance and guarantee the safety of the whole system, it is of importance to predict and analyze the characteristics of these complicated flows. In this study, before applying to concerned problems, such as the flows in the mud pipeline and mud gas-liquid separator, two-dimensional numerical simulations for some typical multiphase problems were carried out by newly developed solver. The governing equations were discretized by FVM(Finite Volume Method) for general curvi-linear coordinate systems. THINC-WLIC (Tangent Hyperbola for Interface Capturing-Weighted Line Interface Calculation) scheme was used to capture the air-water interface. For the convection terms of Navier-Stokes equations, the MUSCL(Monotonic Upstream-Centered Scheme for Conservation Laws) with TVD(Total Variation Diminishing) scheme was adopted. Firstly, as a benchmark test, Rayleigh-Taylor instability was simulated. The results by present solver showed reasonably good with those of analytic solutions and by other numerical simulations. Then, bubble rising in a unbounded domain and in a bent pipe were simulated.