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FEM and CFD simulation

FEM and CFD simulation

Mechanical Simulation - FEA and CFD

One of the most important needs of manufacturing companies is a new product design and old products update and improvements.
Today, it is possible to do the whole design and simulation process by CAD and CAE software with high speed and good quality. The design process can be carried out using finite element analysis software and applying any types of analyzes like static analysis, dynamics, Computational fluid dynamic (CFD), and mechanism analysis. We can find prototype or product weaknesses or possible failure parts and assemblies using CAE software. Having a great background in industrial projects in ARACo and with a good understanding of the mechanisms and production process, We are ready to carry out CFD, FEA(FEM), aerodynamics, Fire and smoke, and free-surface simulation projects. Following you can see a list of simulations, which we can run in ARACo:
- Heat transfer simulation(heat exchanger)
- Electrical heat transfer simulation(PCB and circuits)
- Static simulation(finite element method for chassis structure, part, and device)
- Aerodynamic simulation
- Fire and smoke modeling and simulation using PyroSim and FDS software
- HVAC(ventilation) CFD
- Tunnel ventilation simulation
- Free-surface simulation and modeling

Heat exchanger simulation in middle eastHeat transfer and flow simulation in shell and tube heat exchanger using CFD method
 

Computational Fluid Dynamics(CFD)

In continuum mechanics, fluid mechanics is a large branch. Fluid mechanics begins with the same principles as solid mechanics, but what distinguishes them, is that unlike solid, fluid is not able to withstand shear stress. According to this point, there are some equations for fluid motion analysis. To respect the British and the French mathematician, these are called the Navier-Stokes equations. CFD(Computational Fluid Dynamics) is solving the Navier-Stokes equation for the small volumes from the original model. In this method, the computational domain(Model) will divide into tiny volumes during the meshing process.After applying the boundary conditions, CFD software will solve the Navier-Stokes equation for all small elements in model volume.
Computational Fluid Dynamics(CFD) in terms of the overall trend is similar to static and dynamic analysis. Both methods solve equations in small meshed elements.
By increasing computer processing speeds, CFD and FEM analyzes have found a special place in the design and manufacturing process. Some data that can be calculated in Computational Fluid Dynamics :
- Fluid speed, temperature, and pressure data at any point of the model
- Fluid speed, temperature, and pressure plot in the interior and exterior surfaces
- Flow path diagram (flow trajectories)
- Heat transfer charts and plots in the outer surfaces and boundary
- Flow movement animation

Analysis and simulation of heat transfer and fluid(CFD), can be done with software such as Fluent, Ansys, and Flow-works used in different parts of the industry. Some of the CFD simulation samples are :
- Industrial ventilation and air conditioning simulation
- Turbine and compressor simulation
- Tunnel ventilation simulation
- Heat exchangers simulation
- Pumps and valves CFD simulation

 

http://cfd-fem-fea-fds-simulation.blog.ir

Velocity and pressure simulation inside ball valve
 

Static and dynamic analysis and simulation - finite element method (FEM and FEA)

Finite Element Method is a numerical method for approximate solutions of partial differential equations and solving integral equations. The practical application of finite elements is commonly referred to as finite element analysis(FEA). In the finite element method, the object or 3D volume divide into small elements, and then software could solve the equations in the 3D model. It should be noted, that the accuracy of finite element analysis strongly depends on the quality of modeling, boundary conditions, and assignment of the correct material, and proper meshing of the model.  Simulation and analysis of finite elements are used for static and dynamic loading in mechanical equipment and structures.

Meshing process in finit element simulation and analysis

Analysis and simulation of aerodynamics and hydrodynamics

Aerodynamic simulation can be used to check the behavior of a product or part, against the air or wind. The main goal of aerodynamic is to calculate the direction, speed, and pressure of air on surfaces. This type of simulation is used in many products including automobiles, trains, aircraft, and even rockets. In these cases, designers try to design geometric forms in a way, that will have the least aerodynamic resistance against airflow. Simulation and Analysis of hydrodynamics are exactly like the simulation of aerodynamics with the difference that water is considered as the main fluid. This type of simulation is used to design ships, fleets, yacht, and submarines. using our great background and with valuable experience in industrial projects, we could carry out aerodynamic and hydrodynamic projects worldwide, in ARACo.

Aerodynamic simulation of a racing car using CFD

PyroSim and FDS Simulations

PyroSim is software, which based on the Fire Dynamics Simulator(FDS) engine. PyroSim helps companies to understand and manage the details of complex fire models. PyroSim and FDS are both using as main software to simulate the fire and smoke in different environments like buildings, parking lot, Subway, Tunnel, Cinema, Commercial office complex, and other places. Using Pyrosim simulation, it is possible to define smoke detectors and sprinklers in a 3D model, to examine the design in case of fire. We can also link PyroSim results with Pathfinder software, which is advanced evacuation simulation software combined with high-quality 3D animated results.
Fire and smoke modeling usually define as a time transient simulation. the result of the "Pyrosim" simulation, could show us how the fire and smoke will spread and what is the effect of the ventilation system in a fire. For example, we can understand the effect of jet-fan if an accident occurs in the tunnel and some cars start burning.

Fire and smoke simulation and modeling in car park with Pyrosim