PUB - Development and Use of a Two-phase CFD Solver for Metamodeling of a Hydraulic Reservoir

27/05/2019

A manuscript on “Development and Use of a Two-phase CFD Solver for Metamodeling of a Hydraulic Reservoir” was published in proceedings of the 10th International Conference on Multiphase Flow (ICMF 2019) in Rio de Janeiro.

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Abstract

CFD domain Fluid domain and its velocity contour simulated with CFD solver

The fluid in a hydraulic system consists of a single liquid phase only in the idealized case. One of the impurities that results in multiphase flow is air. The entry of air into hydraulic fluids is inevitable. The negative effects of undissolved air, which exists in the form of bubbles, on the system components and properties are not negligible. The present study therefore focuses on the existence of air bubbles in the hydraulic oil.

The accumulated air can be released from the system through the hydraulic reservoir. Different variables such as oil flow rate and air load at the inlet of the reservoir influence the air release efficiency of the hydraulic reservoir. The amount of air, which remains in oil at the outlet of the reservoir, can be estimated experimentally or with CFD simulations. But both these methods are time consuming and expensive. A solution for this problem is using metamodels.

The objective of this paper is to further develop a CFD solver for simulating the two-phase flow in a hydraulic reservoir and using its results for metamodeling. The developed two-phase CFD solver utilizes the open-source CFD tool, OpenFOAM, based on a coupled Euler-Lagrange approach.

actual vs. predicted Variables Copyright: ifas Actual responses vs. predicted responses from the model (left) Summary of the effect for the influence variables (right