The purpose of this exercise is to simulate the flow of fluid through a cylinder-shaped pipe. OpenFOAM pipe flows have received a significant amount of research and are considered to be very important in the field of fluid mechanics.
When certain fundamental presumptions about the flow field are applied, deriving the governing equation for flow through a pipe is a straightforward process. The Hagen–Poiseuille equation is a name given to such a simplified form of an equation.
We are interested in modelling fluid flow through a pipe using a computer simulation and then contrasting the modelling effort results with the answer obtained by directly solving the Hagen–Poiseuille equation. This should be possible without any issues using a high-quality CFD code.
The next necessary steps
- Having a theoretical understanding of how pipe flow works
- To determine the length of the pipe’s entry point, the Hagen-Poiseuille equation was utilised.
- Calculate the pressure drop using Hagen-Poiseuille
- Create a pipe in OpenFOAM and run a flow simulation through it by following the steps below in order:
- In preparation for geometry
- Meshing
- Conditions for the Establishment of Boundaries
- The choice of solvers
- Post-processing
Contextualisation of the Theory
It is assumed that the flow of fluid inside the pipe is laminar. The surface contact between the water and the pipe wall will cause the water molecules to come to a complete halt near the walls. This will cause the molecules to slow down. Because of the friction caused by these layers of water molecules, the flow of the water in the adjacent layers will also be slowed down. Because of this velocity, the water drops in the core of the pipe have to keep a constant speed to keep the volumetric flow rate consistent.
As a consequence, the velocity boundary layer forms along the boundary walls of the pipe, and then it begins to start in the direction of the flow and continues to do so until it reaches the centre of the pipe. The term “hydrodynamic entry length” refers to the distance that extends from the pipe inlet to the point where the boundary layer converges. The fully developed region is part of the water column extending beyond the hydrodynamic entry length. Buy Adderall Online
The Choice of Solvers
A solver essentially explains what mathematical equations are being solved as well as the process that is being used to solve them. The solver that you decide to use is a critical choice. You must be completely aware of which equations apply to the issue. Using an incorrect solver will invariably produce false results. In this particular instance, we are utilising a solver known as SimpleFOAM. Every single solver has its unique configuration options. That is to say, the number of setting files that are necessary for a specific problem will vary depending on the solver used.
OpenFOAM simplifies the process by which the user can determine which additional setting files are necessary for a particular solver. They accomplish this goal by supplying tutorial files tailored to each solver. The user should begin by selecting the solver they intend to use, after which they should grab the example that OpenFOAM provides and modify it so that it meets their requirements.
You may be curious about the number of files required to configure the SimpleFOAM solver. The particulars are as follows:
To run a basic pimpleFOAM program, you must set up the system file, the constant file, and the 0 (zero) file. This assumes that the mesh, turbulence properties, and initial and boundary conditions have already been set up.
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