Free Software Package SIGMA_FW for Numerical Simulation of Hydrodynamics and Heat Transfer

Computational fluid dynamics as a method for studying wind comfort

“…A numerical study was conducted for wind flow streamlining the urban neighborhood unit with a high-rise 134 m building and a 4-level podium. The research was carried out using the SigmaFlow commercial software package [5][6][7] The calculation results show that airflow changes because of interaction with an obstacle. First of all, this is due to a change in its direction and a decrease in wind speed to less than 1 m/s from the windward side, as well as when flowing around sharp angles, unsteady three-dimensional structures are formed, which lead to the formation of flow separation zones with wave effects.…”

Numerical simulation of co-combustion of diesel and pulverized coal fuel in a small-sized furnace

“…2 and 3 show, respectively, the schematic diagram of the simulated tangential burner device and the used computational grid. The papers [15,16] present the results of comparing the data obtained by calculation and in an experiment performed at the Institute of Thermal Physics of the Siberian Branch of the Russian Academy of Sciences when burning diesel fuel [15] and a mixture of diesel fuel and coal [16]. It is shown that the calculation model reproduces the experiment well, both in terms of temperature and gas composition (Fig.…”

The identification problem solution of the ventilation system model based on static pressure

“…The identification problem is set as follows: Determine the minimum values of local resistance coefficients ‖ξ m ‖ 2 → min for identifiable branches and groups of identifiable branches satisfying the condition for minimum, distinguishing the calculated and experimental values ‖ ‖ 2 → of the static pressure = − , ∈ and the flow -rate = ( ∂ℎ ∂ ) ⋅ ( − ), ∈ at the control points , under the system of equations ( 4), (5). Here , are measured and calculated static pressures at control points ( ), , are the measured and calculated flow rate at the control points( ).…”

“…When analyzing the systems operation supporting the gas flow, different research methods can be used [1,2]: the theory of hydraulic circuits [3], 3d modeling methods [4,5], test measurements of real-life objects [6]. In this case, the results obtained by one method in other methods are certain to be used [1].…”