'Water flow through globe valve' simulation project by dheiny


#1

I created a new simulation project called 'Water flow through globe valve':

This project shows how SimScale can be used to analyze the fluid flow through valves.


More of my public projects can be found here.


#2

Description


 
Dating back to the Mohen Jo Daro civilization, plumbing technology has shaped up and gained maturity over the past centuries. Despite the multiple advances that have been made in this field, there is always room for improvement and optimization. Simulation may easily be used as a tool to analyze the performance of a plumbing mechanism. To determine a new design or choose among several existing ones for a specific purpose is made possible by CFD (Computational Fluid Dynamics).
 
For instance, let us consider a regular pipeline assembly with shutoff valves. Essentially, a shutoff valve controls (obstructs, mediates or allows) the flow of water through it. Contemporarily, three kinds of shutoff valves are predominantly used:
 

  1. Ball valves
     
    image
     
  2. Gate valves
     
    image
     
  3. Globe valves
     
    image
     

Project Goals


 
In the current project, we shall study the performance of a globe valve. In construction, a globe valve consists of a cylindrical plug (with axis perpendicular to the direction of water flow) suspended by a stem, which perfectly fits in between a stationary ring seat. The stem connects the plug (disk-shaped) to the valve handle as can be seen in the image above. The plug can move only in the direction perpendicular to the flow, varying the space left out for the water to pass through, thereby regulating the flow of the valve.
 
With the help of the SimScale platform, we shall simulate the flow of water through a globe valve, trying to comprehend the various processes occurring before, during and after the passage of water through the valve.
 

Geometry


 
The CAD model for this project is provided by Krzysztof Buczak. The first step to analyze the fluid flow through this valve is to extract the inner fluid flow volume of the valve, a common feature offered by CAD systems. In this case, the volume extraction is performed using SpaceClaim.
 
image
 

Meshes


 
The inner volume is meshed within SimScale using the Hex-dominant mesh operation. A mesh refinement is used for for the central region in order to resolve the higher gradients that are expected in this region. Additionally, a refined viscous boundary layer is added to the mesh. The meshing is carried out on 2 cores and the resulting mesh, shown in the figure below consists of 460,000 cells.
 


 

Simulations


 
Subsequently, the mesh is used to set up a turbulent, steady-state and incompressible fluid flow analysis. The k-epsilon model is chosen to account for the turbulence effects. The necessary boundary and initial conditions are assigned to the correct faces.

Despite the simulation being set up as a steady-state simulation, there might be several transient turbulent effects that are not captured with this simulation setup. As a result, it is rather a rough first analysis of the flow. In order to capture more details of the flow, one could easily setup a finer mesh and use a transient analysis type. The actual simulation is then carried out on four cores which takes around 50 minutes. The residual plots can be watched live during the simulation in order to track the progress of the simulation.
 

Results and Conclusions


 
As soon as the simulation is finished, the results can be analyzed and visualized in the integrated post-processing environment which is shown in the image below.


#3

Wonderful simulation and well done!. I was wondering if you would create a model for butterfly valve.


#4

Hi @ccccleung!

You can have a look at a butterfly valve analysis here: Butterfly valve flow analysis

If you type in butterfly into the search field in Public Projects (which can be found on the top of this page) you will find a bunch of examples :slight_smile:

Cheers!

Jousef


#5

Hello Sir,


How do I obtain CAD drawings to be exported to ansys fluent?