Commissioning experiment for joint physical and numerical analysis

Gajsin Ajnurt Al'bertovich

Federal state budgetary educational institution of higher education «Russian Timiryazev State Agrarian University», Moscow, Russia

Abstract:

This work is devoted to carrying out commissioning experiments to verify the acceptability of the mathematical model, computational grid and boundary conditions for numerical modeling of fluid flow in the hydrodynamic flow regulators. Verification of a numerical experiment was conducted using laboratory studies. The physical experiment was constructed in a reversed hydraulic tray. Measurements of local velocities in the outlet section of the diffuser was performed in the control points using utrirovannoe tube Prandtl-Pitot. Numerical simulation was performed in STAR-CMM+. The model is based on threedimensional unsteady Reynolds equations. Turbulence was modelled with standard k-ε model. The calculation method is implicit. Modeling free-surface flow was carried out with the use VOF two-phase interaction with the gravitational component. Boundary conditions were taken as the hydrostatic pressure for the input and the output section of the experimental model, the velocity on the inner walls of the model, which was assumed to be zero, and the absolute roughness of all surfaces. The results of the value of local velocities showed good agreement with experimental values. The studies confirmed the effectiveness of joint physical and numerical experiment, which allows to reduce the number of model studies. Analysis of the values obtained in numerical and physical experiments, allowed us to conclude that numerical simulation agrees well with experimental data with an error of less than 5 %. As a result of the physical experiment proved the correctness of the simulation of fluid flow in diffusers at the exit of the flow in the downstream in the software package STAR-CCM+.

Keywords:

Hydrodynamic regulator, diffuser, speed, numerical simulation, STAR-CCM+.