Equipment Cooling and Industrial Ventilation
Design and Construction of Internal Fans for Cooling System of a Three Phase Induction Electric Motor Using CFD Simulations
This project was performed in 2014 to modify the cooling system of a three phase 2 MW induction electric motor for full load operation during summer. At the first step the geometrical characteristics such as the size of the rotor, stator, inner ducts and geometric details of fans and heat exchanger were extracted. After a complete 3D geometric modeling of electric motor, fine mesh using 34 million elements was generated and a comprehensive thermo-fluid analysis was performed. Because of electric motor heat flux variation with loads, coupled simulation between heat exchanger and electric motor must be executed. Through deep insight observed using CFD simulations of flow distribution and heat transfer in heat exchanger and electric motor, sensitivity analysis of different part modifications such as cold fan, hot fans and heat exchanger were specified. Finally new fans were designed and constructed for cooling system retrofit.

Design and Construction of Cooling System for Dynamometer Test of a Wankel Engine Using CFD Simulation
This project was performed in 2012 with the aim of design and construction of a cooling system for dynamometer test of an air cooled wankel engine. At the first step a precise 3D model of the engine with cooling fins was created. Then because of heat transfer sensitivity to mesh size, professional mesh was generated for engine and domain. With specifying the performance of the engine and fuel consumption, engine heat flux was found out. Using the maximum heat flux, the required air flow speed for cooling was specified. Then fan and duct were designed using numerical simulations. Finally the fan and duct were constructed and operational tests of cooling system had quite well agreement with CFD simulation results.

Knowledge of Transformer Room Ventilation Design provision Using CFD Techniques
This project was performed in 2010 with the aim of transformer room ventilation design knowledge production. At the first step a comprehensive measurement from 40 transformer rooms including the air temperature, inside room air temperature, transformers surface temperature, room size, cooling area and the arrangements was done. At the second step a sensitivity analysis of different parameters was studied. After a deep insight into ventilation using CFD simulations, a comprehensive design criteria for transformer rooms ventilation with one or two transformers with the power of 630, 800, 1000,1250 and 1600 KVA for on-ground or under-ground was produced. According to the simplicity of the standards and the dependency of ventilation design to geometric parameters, this project developed a deep insight through the industrial ventilation design in Arya Alborz Company.

Piston Effect Phenomenon Study Using CFD Simulations in Subway Ventilation Design
This project was performed in 2010 with the aim of subway stations ventilation design and optimization using CFD simulations. Subway movement in tunnels can cause the blowing and suction of air from ventilation ducts. One of the most widely used software for subway ventilation design is SES. SES software uses empirical correlations for linear ventilation design of stations. Today, with the improvements in hardware and software industries, CFD analysis can be used for ventilation design and also to exert the piston effect of other stations using Dynamic mesh simulations. With the unsteady simulation of train movement, the static pressure fluctuations were specified in the stations and the knowledge of piston effect phenomenon for subway ventilation was developed in Arya Alborz Company based on numerous CFD simulations.

Ventilation Study of a Road Tunnel Using CFD Simulations
This project was performed in Arya Alborz Company to produce the knowledge of road tunnel ventilation design. Jet fans are used for road tunnel ventilations to push the air in different scenarios. Traffic situation and firing mode are the sensitive parameters. The firing mode is the critical mode that is considered for road tunnel ventilation design. Using CFD simulations the most effective scenarios for jet fan operating in firing mode in different locations of the tunnel and taking into account the various parameters such as the slope of the highway is achievable. In this project a firing source term was created in different locations and the effect of different arrangements, scenarios and jet fan power on smoke ventilation was widely studied. Based on researches a deep insight into road tunnel ventilation design was produced in Arya Alborz engineering group.

3D Numerical Simulation of Heat Transfer in a p4 CPU Heat Sink
This project is performed in 2002 with the aim of heat sink cooling design knowledge reverse engineering. Geometric parameters of heat sink and CPU loading are some of the sensitive factors that were reviewed. CPU heat source is exerted to the simulation as a boundary condition at the bottom of heat sink. Using CFD simulation the effect of CPU load, heat sink design and fan power was studied and a good insight for electronic device cooling was provided in Arya Alborz Company.

Comprehensive CFD Simulation of an Ejector for Exhaust Cooling
This project was performed in 2013 to develop the knowledge of ejector design for exhaust cooling using numerical simulations. Ejectors can be used in various industries for hot gas cooling. In this technique hot fluid passes through narrow holes and sudden pressure drop reduces the temperature. Besides producing high speed gases inside the chamber, reduction in static pressure can vacuum the fresh air that can be mixed with hot exhaust and eventually the performance can be increased. Reverse engineering process was executed on an ejector. At the first step a 3D model was created. After mesh generation, comprehensive thermo-flow analyses using CFD simulations were performed. Based on the studies, the effect of various geometric and operating parameters on cooling performance was specified and was validated with experimental tests. In this project a deep insight into ejector design for all industries was produced in Arya Alborz Company.

Primary Simulation of j-85 Blade Cooling Using CFD Simulations
This Project was performed in 2009 with the aim of design review of stator blade cooling strategies using CFD simulations. Film cooling and convective cooling are the two main strategies for rotating equipment blade cooling. In convective cooling the holes are placed close to the trailing edge. In this technique the coolant air enters from the root of the blades and after passing through the baffles, absorbs the blade heat and exits. In film cooling technique the coolant air flows through the baffles and exits from the holes placed at the leading edge. Coolant air flows from leading edge holes leads the formation of a cooling film on the blade and eventually reduction in direct contact of combustor hot gas with blades surface. Due to stress dependence to temperature, cooling can help the design and equipment life extension. Using CFD simulation the optimum design of internal baffle was also studied. Internal baffles design can change the percentage of coolant air distribution through trailing edge or leading edge. Using comprehensive CFD simulations, the effect of film cooling on flow angle and rotor torque was also specified. This project has produced a deep insight into the blade cooling design of rotating equipments in Arya Alborz Company. In picture below the flow patterns in stator stage without any baffle is presented.

Simulation and Optimization of Uniform Hot Jet Using CFD Techniques
This project was performed in 2011 with the aim of uniform hot jet creation for food industry. Heat can penetrate to the center of the dough in bread cooking, using hot jet system. Using a uniform hot jet can lead to a proper baking. At first step a 3D model was created for primary analysis. Then after mesh generation and fluid flow simulations, baffles were designed to produce a uniform hot jet for bread cooking.