Manometer of Venturimeter CFD Simulation by Ansys Fluent, Training

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In this project, a monometer has been simulated, and the results of this simulation have been investigated.

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In this project, we study a Manometer of Venturimeter CFD Simulation by Ansys Fluent, and it has been shown how there is variation in U-tube manometric fluid column. The multiphase  VOF model has been used. A convergent and divergent nozzle has been used to create a pressure difference. One end of the manometer is attached at the throat, and the other at the converging section. There is a rise in the liquid column in the U- tube manometer at the low-pressure region.

Monometer of Venturimeter CFD Simulation by Ansys Fluent

Venturimeters are pressure measurement devices that are commonly used in everyday life. For example, pressures in piping systems are constantly monitored using these devices. The U-tube manometer is a special manometer that gets its name from its U-shaped tube. The straight portions of this U are commonly referred to as the manometer’s arms, limbs, or ends. The manometer is typically filled with a dense, colored fluid called the manometer fluid, which is used to visualize the pressure difference between the two ends of the tube. As the pressure at one of its ends increases, the manometer fluid inside the tube is pushed downward at that end.

This causes the manometer fluid to rise at the other end of the device. The difference in the fluid levels between the two ends is then used to measure the pressure difference. When used properly, the manometer, one of the earliest pressure-measuring instruments, is very accurate.   The manometer has no moving parts subject to wear, age, or fatigue. Manometers operate on the Hydrostatic Balance Principle: a liquid column of known height will exert a known pressure when the weight per unit volume of the liquid is known.

Geometry & Mesh

The 2-D geometry of the present model is generated using Design Modeler 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 42,413.

Ansys Meshing

CFD Simulation

To simulate the present model, we consider several assumptions:

  • The solver is pressure-based.
  • The current simulation is unsteady in terms of time.
  • The gravity effect is equivalent to -9.81 m.s-1.

Here is a summary of the steps for defining the problem and its solution in the following table:










Homogeneous model Volume of fluid



Number of Eulerian phases 2(air& mercury)



Interface modeling Sharp


Formulation explicit



Body force formulation Implicit body force

Viscous model



Material Properties








Density 1.225



viscosity 1.7894e-05






Density 13529



viscosity 0.001523
Boundary conditions
Inlet air


Velocity inlet
volume fraction





velocity magnitude 1.8 m.s-1
Outlet Pressure outlet

gauge pressure



0 Pascal




air backflow volume fraction





Solution Method

Pressure-velocity coupling





Spatial discretization









first-order upwind






Volume fraction



Geo reconstruct





Turbulent kinetic energy


First-order upwind





Turbulent dissipation rate



First-order upwind


Initialization method


















Volume Fraction





Registers to patch










Run calculation
Time step size  


Max iterations/time step  



Number of time steps



Monometer Results

First, a volume fraction diagram was drawn in different positions in this simulation. Then two-dimensional contours related to density, streamline, air volume fraction and mercury volume fraction were obtained. The images show that Initially, the height of the liquid column is equal on both sides. But as the gas enters the manometer, the height of the mercury column changes.



  1. Avatar Of Vada Beatty

    Vada Beatty

    The training materials look quite comprehensive! After going through the simulation, I found the visuals for the liquid column movement particularly helpful in understanding the pressure changes within the Manometer setup.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your feedback! We are thrilled to hear that the simulation visuals were helpful for you to understand the concept of pressure changes in the Manometer. We strive to provide clear and instructive materials, and we’re glad it made a difference in your learning experience.

  2. Avatar Of Calista Cruickshank

    Calista Cruickshank

    Can you provide more insight on how the initial conditions of air and mercury volume fractions were set up for this simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In this simulation, the initial conditions for air and mercury volume fractions were set to represent the beginning state of the manometer. At the start, the mercury column is at the same level on both sides of the U-tube. Standard initialization was used with the patch method to specify that the region representing the manometer’s limb has 0 volume fraction for air, meaning it was fully occupied by mercury initially.

  3. Avatar Of Hal Beahan

    Hal Beahan

    The training on Monometer CFD Simulation was comprehensive and illuminating. The setup details were systematically explained, and understanding the application of the VOF model in Ansys Fluent within the context of a U-tube manometer made it easier to grasp the concept of pressure measurement in fluids. The step-by-step guide on setting up boundary conditions and initial parameters further aided in solidifying the knowledge. Excellent material for anyone looking to enhance their skill in computational fluid dynamics!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re thrilled to hear that our training module on Monometer CFD Simulation using Ansys Fluent met your expectations and proved helpful. It’s always rewarding to know that our content is assisting customers in improving their CFD skills. If you have any more questions or need further assistance, feel free to reach out. Keep learning and happy simulating!

  4. Avatar Of Donavon Mohr

    Donavon Mohr

    This training was illuminating! The level of detail provided in setting up the conditions for the U-tube monometer simulation really helps to understand the underlying principles of the mechanics involved. Seeing the progression of the mercury column as the pressure difference changes is fascinating!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive review! We’re thrilled to hear you found the monometer simulation details and the demonstration of principles through ANSYS Fluent enriching. Insights into fluid mechanics can indeed be fascinating, and we’re glad our training could illuminate this area for you. Should you have any questions or need further assistance in your learning journey, don’t hesitate to reach out!

  5. Avatar Of Prof. Marilou Hoeger Dds

    Prof. Marilou Hoeger DDS

    I just completed the Monometer CFD Simulation by Ansys Fluent training, and I must say I’m quite impressed with how comprehensively it covered the U-tube manometric fluid column variation. The detailed geometry and precise meshing instructions facilitated a clear understanding of pressure calculations using a simple yet effective device. Following along with the simulation steps and observing the real-time changes in fluid volume fraction provided a hands-on learning experience that reinforced theoretical knowledge flawlessly.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to hear that the training provided you with a thorough understanding and practical experience in managing the Monometer CFD Simulation. It’s fantastic to know that our approach to teaching complex fluid dynamics principles via hands-on simulation was effective for your learning. If you have any more questions or need further assistance, feel free to reach out!

  6. Avatar Of Dr. Nayeli O'Kon Iii

    Dr. Nayeli O’Kon III

    I enjoyed learning with the Monometer CFD Simulation training by Ansys Fluent. The clear step-by-step process and detailed assumptions made it easy to follow. The way the tutorial progresses from creating the geometry to running the calculations was practical and engaging.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to know that our Monometer CFD Simulation training module helped you understand the process clearly and was engaging for you. Your satisfaction is our priority, and we’re pleased that we could provide an informative and enjoyable learning experience.

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