Siphon Simulation, Ansys Fluent Training
In this project, a siphon has been simulated and the results of this simulation have been investigated.
This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Siphon Project Description
Water always flows from an area under higher pressure to an area of lower pressure. The siphon effect takes place when the fluid flows to the highest portion of the bend pipe due to the pressure difference and then comes down from there due to the presence of gravity.
In this project, a Numerical simulation of a siphon has been done by Ansys Fluent software. The VOF model has been used to simulate and solve the two-phase flow field equations. The flash tank discharges and the siphoning effect causes the water to drain.
Geometry & Mesh
The 2-D geometry of the present model is generated using SpaceClaim software.
The meshing of the present model has been done using Ansys Meshing software. The mesh type is unstructured in all of the computational domains, and the element number is equal to 95,451.
Siphon CFD Simulation Settings
We consider several assumptions to simulate the present model:
- Due to the incompressibility of the flow, the pressure-based solver method has been selected.
- The simulation is transient.
- The gravity effect is considered equal to -9.81 m.s-2 on Y-axis
The K-epsilon Realizable viscous model with scalable wall function has been used to solve the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for Momentum, and the first-order upwind discretization method has been used for Turbulent kinetic energy and Turbulent dissipation rate.
The boundary conditions and their details are shown in the figure below.
The following tables represent a summary of the defining steps of the problem in this project and its solution:
|Homogeneous model||Volume of fluid|
|Number of Eulerian phases||2(air & water)|
|Near wall treatment||Scalable wall functions|
|Cell zone conditions|
|Operating density method||User-input|
|Free surface||Pressure inlet|
|Turbulent kinetic energy||First-order upwind|
|Turbulent dissipation rate||First-order upwind|
|Initialization methods||Standard (from the free surface)|
|Zones to patch||water|
|Time step size||0.002|
|Max iterations/time step||20|
|Number of time steps||3500|
After the solution process is completed, contours of velocity, Pressure, water volume fraction, and streamline are extracted and presented below. As can be observed, the water inside the flash tank discharges and cause the siphoning effect. Due to the siphoning effect, water will pass through the pipe and go to the highest point, and then due to the action of gravity, it will come downward. Once the water flow has begun, the water will continue to flow, draining the ponding water area off.
You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.