CFD simulation with moving elements
In a conventional CFD simulation, the domain is divided into small control volumes. When an object within that fluid moves (e.g., a piston or valve), the original mesh no longer matches the original boundaries of the domain. However, these situations are very common in processes and products, so CFD simulations with moving elements represent an […]
CFD and multiphysics simulation of industrial processes
Improving industrial processes is a constant goal in industry. Companies devote considerable effort to optimizing efficiency and reducing production costs and times. In this regard, simulation using Computational Fluid Dynamics (CFD) and other computational techniques has become a tool of great interest for the design and improvement of processes in various sectors. From the storage […]
Flow-induced vibration studies
Analysis approach In this study we seek to apply CFD simulation to obtain the forces originated by the flow in a submerged tunnel, especially the dynamic component of the vertical force. In the dimensioning of these structures, this load must be considered together with the contributions due to traffic, self-weight, etc. Computational fluid dynamics allows […]
Particle methods in CFD simulation
Computational Fluid Mechanics (CFD) allows increasingly accurate and efficient simulations of complex fluid dynamic phenomena. In this entry we will discuss a family of particle-based numerical methods. Among these methods, the most common are Smooth Particle Hydrodynamics (SPH) and Moving Particle Semi-Implicit (MPS), which have proven to be especially effective in problems with free surfaces, […]
CFD Simulation: Baffles Drop Structures
Baffle Drop structures are used to convey urban water flows into tunnels, usually underground. Water cascades down the baffles to a waterlogged area below which drains into a tunnel. The structure has been used successfully in urban drainage projects. However, its hydraulic characteristics pose a challenge at the design and engineering stage. In the following […]
CFD-10. Diffuser. Influence of inlet conditions.
This post on Computational Fluid Dynamics (CFD) continues the series of posts dedicated to the CFD simulation of scenarios where turbulence plays a fundamental role. In this case, we discuss the importance of defining flow inlet conditions that accurately represent reality. We work again with a practically two-dimensional domain as the device has a clear […]
CFD-15. Scale-Adaptive Simulation Model
With this entry on Computational Fluid Dynamics (CFD) we finish the series of cases related to turbulence modelling. In this example we will deal with the SAS (Scale-Adaptive Simulation) method that solves turbulent structures by adapting the resolution scale to the mesh size and time step used. In this way, a solution similar to that […]
CFD-14. Flow transition with hybrid turbulence models.
In this new entry on Computational Fluid Dynamics (CFD) we will study an advanced turbulence model that combines the ideas of the hybrid LES-RANS model with the ability to represent laminar-turbulent transition effects. We will perform a study with an unsteady transition flow around a cylinder. The steps to follow can be found in the […]
CFD-13. LES-RANS Hybrid Turbulence Models
In this entry on Computational Fluid Dynamics (CFD) we continue analysing case studies where turbulence plays a fundamental role. In particular, we will see a comparison of results between a usual RANS model and a hybrid LES-RANS turbulence model. The study model, which can be seen meshed in the following image, has a section change […]
CFD-12. LES simulation. Addition of Artificial Turbulence.
In this new post on Computational Fluid Dynamics (CFD) we will see a simple CFD simulation case using a LES (Large Eddy Simulation) turbulence model. This will allow us to see the eddies and instabilities of turbulent flow in a pipe. In order to observe this phenomenon we will include some artificial turbulence in the […]
CFD-11. External Aerodynamics. Flow with Transition.
In this post on Computational Fluid Dynamics (CFD) we will deal with an example of external aerodynamics where it is essential to capture the regime transition effects well. This case requires a special turbulence modelling since in most CFD simulations it is possible to work considering that the flow is at all times only laminar […]
CFD-09. Curved channel flow. SST turbulence model.
In this post on Computational Fluid Dynamics (CFD) we begin a series of posts dedicated to studies where flow turbulence plays a fundamental role. In this first example we study the flow through a curved channel, where the SST (Shear Stress Transport) turbulence model may be applied. As shown in the picture, we will use […]
