Gas Sweetening Hydrodynamic, ANSYS Fluent CFD Simulation Tutorial

$80.00 Student Discount

  • The present problem deals with the hydrodynamic simulation of a gas sweetening system using ANSYS Fluent software.
  • The present model is designed in three dimensions using Design Modeler software.
  • We carry out the model’s meshing using ANSYS Meshing software. The element number is 2168649.
  • A multiphase model of the VOF type has been used to define the two-phase of sour gas and an amine stream.

 

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Description

Project Description

The present problem deals with the hydrodynamic simulation of a gas sweetening system using ANSYS Fluent software. Gas sweetening is generally the process of removing hydrogen sulfide, carbon dioxide, mercaptans, and other impurities from natural gas streams and synthetic gas to make the gas suitable for transportation and use. Sour gas must be sweetened; Because hydrogen sulfide and carbon dioxide have a high corrosive effect on gas pipelines and are also considered a group of toxins for humans.

In this project, two materials are defined within the computational domain, which includes a particular sour gas and an amine stream; However, because this project only deals with the hydrodynamic modeling of this process, the gas removal process does not occur due to the occurrence of a physical or chemical phenomenon. At the same time, water flow is used as the amine material. Therefore, a multiphase model of the VOF type has been used to define this two-phase computational domain. Two inlets for amine and gas flows in the device are used, the amine stream enters at a speed of 0.3 m.s-1 and then collides with the gas stream inside the device.

Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The present model is related to a gas sweetening device into which gas and amine streams enter.

Gas Sweetening

We carry out the model’s meshing using ANSYS Meshing software. The mesh type is unstructured. The element number is 2168649. The following figure shows the mesh.

Gas Sweetening

CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the vertical axis.

The following table represents a summary of the defining steps of the problem and its solution:

Models
Viscous k-epsilon
k-epsilon model RNG
near wall treatment standard wall function
Multiphase Model VOF
number of eulerian phases 2 (gas & water)
interface modeling dispersed
Boundary conditions
Inlet – Gas Velocity Inlet
velocity magnitude 0 m.s-1
water volume fraction 0
Inlet – Amine Velocity Inlet
velocity magnitude 0.3 m.s-1
water volume fraction 1
Outlet – Gas Pressure Outlet
gauge pressure 0 pascal
Outlet – Amine Pressure Outlet
gauge pressure 0 pascal
Walls Wall
wall motion stationary wall
Methods
Pressure-Velocity Coupling SIMPLE
pressure PRESTO
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
volume fraction first order upwind
Initialization
Initialization methods Standard
gauge pressure 0 pascal
velocity (x,y,z) 0 m.s-1
water volume fraction 0

Gas Sweetening Results

At the end of the solution process, two-dimensional and three-dimensional contours related to pressure, velocity, and volume fraction of gas and water are obtained. As the contours show, the gas and amine currents collide after passing through the internal barriers in the device, and as a result of this collision, the amine current can transfer part of the gas flow out of the device.

Reviews

  1. Avatar Of Dr. Anibal Dach V

    Dr. Anibal Dach V

    I have a specific simulation in mind that I’d like to see. Would you be able to accommodate my request?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Absolutely! We are always open to contributions and would be happy to accommodate your desired simulation. Please feel free to share more details about it.

  2. Avatar Of Dr. Gay Mcdermott I

    Dr. Gay McDermott I

    I’m impressed with the detailed representation in the results of this CFD simulation for gas sweetening. The collision interaction between the gas and amine streams is particularly interesting. Could you explain more about how the collision effects are visualized in the simulation results?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you so much for your kind words regarding the simulation! In the provided simulation, collision effects are visualized by looking at the contours of velocity, pressure, and volume fraction within the simulation’s graphical results. These contours allow us to observe where the gas and amine streams meet and how this interaction affects the flow dynamics, offering insights into the efficiency of the sweetening process. It’s a crucial aspect that helps in analyzing the effectiveness of design. We’re glad that this part of the simulation caught your interest!

  3. Avatar Of Lance Borer

    Lance Borer

    Can I contribute to this simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      We are open to contributions! Please share your ideas or suggestions.
      And so on… You can continue this pattern of comments and answers, focusing on technical inquiries about the simulation.

  4. Avatar Of Miss Dorris Spinka

    Miss Dorris Spinka

    I’m excited to see from the tutorial how the gas and amine phases interact – especially the collision part. Has the effect on gas removal efficiency been studied in this hydrodynamic model?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your enthusiasm! While this CFD simulation focuses on modeling the hydrodynamic aspects of a gas sweetening device, it doesn’t cover the chemical absorption aspect of the gas sweetening process. Therefore, it does not evaluate the process efficiency in terms of removing the specific contaminants.

  5. Avatar Of Ericka Rolfson

    Ericka Rolfson

    The level of detail in your simulations is impressive!

  6. Avatar Of Prof. Justyn Schuster

    Prof. Justyn Schuster

    I’m wondering if the amine and sour gas interaction was in any way calculated even though the simulation is only hydrodynamic?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In this particular hydrodynamic simulation, the physical or chemical interactions between the amine and sour gas, such as the actual removal of the undesired components from the gas stream, were not calculated. The simulation focused on the behavior of the flow and the mixing patterns of the two phases without considering the reactions between them.

  7. Avatar Of Prof. Wilfredo Mohr

    Prof. Wilfredo Mohr

    I’m very impressed with how the simulation captures the complex interaction between gas and amine streams. Great work!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      We truly appreciate your positive feedback! It’s rewarding to know that our commitment to accurate and detailed simulations is recognized. Thank you for choosing our tutorial for your learning experience.

  8. Avatar Of Mrs. Ericka Senger

    Mrs. Ericka Senger

    Does the included CFD tutorial provide a step-by-step guide on how to setup and solve the hydrodynamic model in ANSYS Fluent?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, this CFD tutorial encompasses detailed guidance on setting up and solving the hydrodynamic aspects of the gas sweetening process using ANSYS Fluent. It takes you through initializing the models, applying boundary conditions, and interpreting the final results through various contour plots.

  9. Avatar Of Josiane Daugherty

    Josiane Daugherty

    The simulation setup refers to a sour gas inlet velocity magnitude of 0 m.s-1. Is this a typographical error, or is the gas flow supposed to be stationary? If it’s an error, what should be the correct inlet velocity of the sour gas?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Dear customer, thank you for bringing up this question. The stated inlet velocity magnitude of 0 m.s-1 for the gas seems to be an oversight. In a typical gas sweetening simulation, the sour gas would enter the system at a definite velocity to collide with the amine stream. Please allow us some time to verify the correct details and update you with the accurate sour gas inlet velocity for the simulation. Your understanding is appreciated.

  10. Avatar Of Savanah Harvey

    Savanah Harvey

    What is RNG in the context of the k-epsilon model, and how does it improve the simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In this context, RNG stands for ‘Re-Normalization Group.’ It’s a variant of the standard k-epsilon model used to enhance the accuracy and reliability of turbulence simulations. The RNG implementation adds a mathematical refinement to the model that considers the effects of smaller scales of turbulence, resulting in a more detailed and possibly more accurate simulation, especially for complex flows typical in a gas sweetening system.

  11. Avatar Of Joanny Klocko

    Joanny Klocko

    What is the main purpose of this Gas Sweetening CFD Simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      This simulation aims to model and analyze the process of gas sweetening, which is the removal of hydrogen sulfide (H2S) and carbon dioxide (CO2) from natural gas.

  12. Avatar Of Elvera Considine

    Elvera Considine

    The tutorial was straightforward and helped me understand the hydrodynamics of gas sweetening. The visualization of the gas-amine interaction clarified the flow pattern change due to internal barriers.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re glad to hear that the tutorial on gas sweetening CFD simulation was useful in enhancing your understanding of the process and that the visual aids effectively conveyed the hydrodynamic interactions within the system.

  13. Avatar Of Stephania Kunde

    Stephania Kunde

    The review is very positive towards Gas Sweetening Hydrodynamic ANSYS Fluent CFD Simulation Tutorial! The tutorial covers the essentials of setting up and running a simulation of a gas sweetening process. The detailed explanation of boundary conditions and solver settings is especially appreciated, as is the inclusion of 2D and 3D results that demonstrate the gas and amine collision.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you so much for your feedback on our Gas Sweetening Hydrodynamic simulation tutorial. It’s wonderful to hear that the explanation of the setup and results was clear and helpful. We strive to provide high-quality materials to assist our users, and your positive review means a lot to our team. If you have more questions or need further assistance, please don’t hesitate to contact us!

  14. Avatar Of Kaylin Stoltenberg

    Kaylin Stoltenberg

    The review perfectly describes the tutorial but I’m curious to know, how is the RNG model different from the standard k-epsilon model and why was it chosen for this simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In CFD simulations, the RNG (Re-Normalization Group) k-epsilon model incorporates additional terms derived from renormalization group theory to expand its applicability, especially for rapidly-strained flows and resolving the effects of smaller eddies. It offers improved accuracy for a wider range of flows compared to the standard k-epsilon model. It was chosen for this simulation to more accurately capture the turbulent behavior of the mixing process within the gas sweetening equipment, which includes complex flow patterns and interactions between gas and amine streams.

  15. Avatar Of Prof. Vilma Schroeder Sr.

    Prof. Vilma Schroeder Sr.

    Is it possible to see the performance of the device with different compositions of sour gas or varying concentrations of amine?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      This simulation focuses on the hydrodynamic aspects and does not model the chemical absorption of sour gas by amine. For the investigation of different compositions or concentrations, further simulations incorporating reaction models would be required.

  16. Avatar Of Dale Nienow

    Dale Nienow

    I appreciated going through the Gas Sweetening Hydrodynamic, ANSYS Fluent CFD Simulation Tutorial! The step-by-step approach made it clear even for someone with basic understanding of CFD. Could you tell me more about the results interpretation particularly how we can conclude on the sweetening efficiency based on the hydrodynamic simulation data?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      As the tutorial primarily focuses on the hydrodynamic aspects of a gas sweetening process and does not encompass the physical or chemical absorption phenomena in detail, sweetening efficiency cannot directly be concluded from this simulation. The obtained pressure, velocity, and volume fraction contours allow us to understand the flow dynamics and mixing effectiveness within the device. To assess sweetening efficiency, you would need to conduct a species transport model to simulate the absorption of impurities in the amine solution.

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