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# User-Defined Function (UDF) CFD Simulation Training Course

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#### User-Defined Function (UDF) Concepts in ANSYS Fluent

• Introduction to USer-Defined Function (UDF) in ANSYS Fluent software
• Introduction to UDF running methods
• Introduction to Mesh Terminology
• Introduction to Model-Specific Macros category
• Introduction to General Purpose Macros category
• Introduction to Multiphase Macros category
• Introduction to Discrete Phase Model (DPM) Macros category
• Introduction to Dynamic Mesh Macros category
• Introduction to Additional Macros category

#### DPM-Drag Macro, UDF, Drag between Particles and Fluid CFD Simulation

• The problem numerically simulates the particle spraying in continuous fluid ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software, and the element number equals 127,100.
• We performed the simulation in Transient (unsteady-state).
• We use the Discrete Phase Model (DPM) to define particle spraying.
• We use the User-Defined Function (UDF) to define a drag between particles and fluid.
• We use the DPM-DRAG Macro for UDF.
• We compare different Drga Laws, including Spherical, Stokes Cunningham, Non-spherical, and High-Mach.

#### Mass Transfer Macro,UDF, Evaporation and Condensation Rate CFD Simulation

• The problem numerically simulates the evaporation and condensation using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software; the element number equals 1,574,100.
• We use the VOF Multiphase model to define water, liquid, and vapor.
• We define a Mass Transfer between water liquid and water vapor.
• We use the User-Defined Function (UDF) to define a mass transfer (evaporation and condensation).
• We use the Mass-Transfer Macro for UDF.

#### DeltaT Macro, UDF, Time Step Control CFD Simulation

• The problem numerically simulates the water filling in the tank using ANSYS Fluent software.
• We design the 2-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software, and the element number equals 135996.
• We performed the simulation in a Transient (unsteady state).
• We use the VOF Multiphase model to define water and air.
• We use the User-Defined Function (UDF) to control time step size.
• We use the DELTAT Macro for UDF.

#### Source Macro, UDF, Momentum Source Term CFD Simulation

• The problem numerically simulates the porous medium with momentum source term using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software.
• The mesh is Structured, and the element number equals 256,000.
• We use the User-Defined Function (UDF) to define a pressure profile.
• We use the Source Macro for UDF.

#### CG-Motion Macro, UDF, Reciprocating Motion CFD Simulation

• The problem numerically simulates the moving object using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software, and the element number equals 143,423.
• We performed the simulation in an unsteady (Transient) state.
• We use the Dynamic Mesh model to define the moving object.
• We use the User-Defined Function (UDF) to define a transitional reciprocating motion.
• We use the CG-MOTION Macro for UDF.

#### Init Macro, UDF, Initial Temperature CFD Simulation

• The problem numerically simulates the double-pipe heat exchanger using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software.
• The mesh is Structured, and the element number equals 147,200.
• We use the User-Defined Function (UDF) to define an initial temperature.
• We use the INIT Macro for UDF.

#### Prandtl-K Macro, UDF, Prandtl number CFD Simulation

• The problem numerically simulates the turbulence model using ANSYS Fluent software.
• We design the 2-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software, and the element number equals 97,972.
• We use the User-Defined Function (UDF) to define the Prandtl number.
• We use the Prandtl_K Macro for UDF.

#### Profile Macro, UDF, Pressure Profile CFD Simulation

• The problem numerically simulates the air pressure profile in an urban area using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software.
• The mesh is Structured, and the element number equals 118,400.
• We use the User-Defined Function (UDF) to define a pressure profile.
• We use the Profile Macro for UDF.

#### Property Macro, UDF, Viscosity Relation CFD Simulation

• The problem numerically simulates the water viscosity exchange based on temperature using ANSYS Fluent software.
• We design the 3-D model with the Design Modeler software.
• We mesh the model with ANSYS Meshing software.
• The mesh is Structured, and the element number equals 133,400.
• We use the User-Defined Function (UDF) to define a viscosity relation.
• We use the Property Macro for UDF.

## User-Defined Function (UDF) CFD Simulation Training Course, ANSYS Fluent

This course, User-Defined Function (UDF) CFD Simulation, is designed to provide an in-depth understanding of User-Defined Functions (UDFs) in the context of ANSYS Fluent, a Computational Fluid Dynamics (CFD) software. UDFs let you modify and improve ANSYS Fluent’s default functionality by including your procedures. They offer a means of altering the behavior of the Fluent solver at many levels, such as source terms, boundary conditions, and material attributes.

## Training Course Syllabus

Our “User-Defined Function (UDF) Training Course” offers a comprehensive syllabus that includes an introduction and nine unique UDF macro products. The course  provide a deep understanding of each macro, its application, and how to implement it in your Fluent simulations effectively.

## Chapter1:User-Defined Function (UDF) Concepts

This chapter will give a general introduction to User-Defined Function (UDF) and an overview of its capabilities. This section contains the following subsection:

• USer-Defined Function (UDF) in ANSYS Fluent software
• UDF running methods (Compiling and Interpreting)
• Mesh Terminology (Mesh Component, Structure Data, Threads, Pinters, …)
• Model-Specific Macros category
• General Purpose Macros category
• Multiphase Macros category
• Discrete Phase Model (DPM) Macros category
• Dynamic Mesh Macros category

## Chapter2: DPM-Drag Macro, UDF, Drag between Particles and Fluid

In this chapter we simulated a simple chamber that is a place for spraying discrete particles, using User-Defined Function (UDF) and DPM-Drag-Macro to write UDF programming. we define a relation to define the drag force between discrete particles and continuous fluid.

## Chapter3: Mass Transfer Macro, UDF, Evaporation and Condensation Rate

this chapter uses mass_transfer Macro to write UDF programming considering a chamber inside which several rows of tubes are placed. Water vapor enters from the chamber’s top and exits from the bottom. Liquid water also passes through the internal tubes of the chamber. to model the phenomenon of evaporation and condensation a Mass Transfer between liquid water and water vapor is needed.

## Chapter4: DeltaT Macro, UDF, Time Step Control

In this chapter, DeltaT Macro is used to write UDF programming for a simple tank where the water flow enters the tank from the inlet opening on the top of the tank. The purpose of this problem is to fill the tank over time.

## Chapter5: Source Macro, UDF, Momentum Source Term

We used Source Macro to write UDF programming in order to simulate a simple channel in which water flows and a porous medium is in the middle of this channel. Since the direction of the fluid flow is along the z-axis, we define the source term for the momentum-z equation using a User-Defined Function (UDF).

## Chapter6: CG-Motion Macro, UDF, Reciprocating Motion

In this chapter, we want an object to move within a domain using the Dynamic Mesh model. So, we define a User-Defined Function (UDF) to apply a translational movement to the object. for this purpose we need to use the CG-Motion Macro (DEFINE_CG_MOTION macro) for this UDF.

## Chapter7: Init Macro, UDF, Initial Temperature

This chapter considers a simple double-pipe heat exchanger and uses Init Macro to write UDF programming to simulate heat transfer which leads to heating the outer tube and cooling the inner tube.

## Chapter8: Prandtl-K Macro, UDF, Prandtl number

In this chapter, we used Prandtl_K Macro to write UDF programming for a simple channel with a turbulent fluid flow inside. To simulate the flow with a standard k-epsilon  model we have to define the Prandtl number for each of the equations of this turbulence model.

## Chapter9: Profile Macro, UDF, Pressure Profile

This chapter considers a sample part of a simple urban area including some volumes as apartments and assuming the space between two rows of apartments as a street and traffic area. We define a relation according to which the pressure varies with height, so we use Profile Macro to write UDF programming.

## Chapter10: Property Macro, UDF, Viscosity Relation

Using Property Macro to write UDF programming for a simple pipe with water fluid flowing inside is in this chapter. The water flow enters the pipe at a low speed and is affected by the thermal boundary condition of the pipe wall. The Viscosity varies with temperature so we use a function describing the viscosity regarding temperature.

## Reviews

1. Ms. Delfina Christiansen

What kind of prior knowledge do I need before taking the User-Defined Function (UDF) CFD Simulation Training Course? Do I need programming experience or just a basic knowledge of CFD?

• MR CFD Support

For the User-Defined Function (UDF) CFD Simulation Training Course, it would be beneficial to have a foundational understanding of CFD principles and some experience with ANSYS Fluent. Familiarity with programming concepts is also important, as UDFs require writing custom codes. Basic to intermediate programming skills, particularly in C or related languages, will help you to get the most out of this course.

2. Otis Dibbert

I completed the User-Defined Function (UDF) CFD Simulation Training Course and found the explanations about different macros so insightful. It was fascinating to see how these macros can impact the simulation in ANSYS Fluent and how they can be applied to various scenarios.

• MR CFD Support

Thank you for your kind words! We are thrilled to hear that you found the course valuable and it provided thorough insights into UDFs within ANSYS Fluent. It’s great to know that the practical examples helped you understand the application of macros in different scenarios. We appreciate you choosing our course for your simulation training needs. If you have any more feedback or require further assistance on your CFD journey, we are always here to help.

3. Zoie Crooks

I just completed the UDF training course and must say it was incredibly comprehensive. The range of macros covered provided ample opportunity to really get to grips with advanced customization in Fluent. Every chapter brought new insights and practical applications that will greatly benefit my future CFD projects. I especially appreciated the hands-on examples that tied in every new piece of theory with practical tasks.

• MR CFD Support

Thank you so much for your positive review! We’re thrilled to hear that our UDF training course met your expectations and provided you with the valuable insights needed for your CFD projects. Practical application stands at the core of MR CFD’s training philosophy, and it is incredibly reassuring to know it is being appreciated. If you have any further questions or need assistance in future projects, please don’t hesitate to reach out.

4. Camron Kuhlman

I appreciate the depth of this course that MR CFD provided. As an engineer, learning about UDFs and how to implement them in simulations in ANSYS Fluent has been incredibly useful. It’s clear that this course is meticulously designed to cover all aspects of UDF application.

• MR CFD Support

Thank you for your positive feedback! We’re delighted to hear that you found the User-Defined Function (UDF) CFD Simulation Training Course beneficial and comprehensive. At MR CFD, it’s our goal to provide thorough educational experiences that empower our customers. Should you need further assistance in your CFD journey, we’re here to help!

5. Joey Towne V

This course has been a game-changer in understanding the depths of ANSYS Fluent through UDFs. Writing custom functions has empowered my simulations and elevated the precision of my CFD projects. Highly appreciate the real-world applications lined up in each chapter!

• MR CFD Support

Thank you so much for your positive feedback! We are thrilled to hear that the UDF CFD Simulation Training Course has enhanced your ANSYS Fluent skills and enabled you to achieve more accurate results. We always strive to present practical scenarios that our users can directly apply in their projects. Your success is the best validation for us!

6. Eusebio Morissette

This course seems comprehensive, can you inform me whether it includes any hands-on practice sessions or projects to solidify the concepts taught?

• MR CFD Support

Yes, the User-Defined Function (UDF) CFD Simulation Training Course combines theoretical instruction with practical exercises. Each chapter focuses on a specific macro and its application, providing you with the opportunity to implement the UDFs in Fluent simulations through guided examples and challenges. This hands-on approach ensures that by the end of the course, you will be adept at using UDFs for various simulation scenarios in ANSYS Fluent.

7. Kolby Kunde DDS

I really appreciated the wide range of macros covered in this UDF Training Course. It provided a thorough understanding of how to tailor Fluent to my specific simulation needs. Could you please illustrate with an example how using UDFs greatly enhanced a particular CFD project compared to using Fluent’s in-built functions alone?

• MR CFD Support

Thanks for the kind words. UDFs can expand the capabilities of ANSYS Fluent by giving you the flexibility to define custom functions specific to your project. For instance, in a project concerning optimal airfoil design, a UDF was used to continuously adjust the angle of attack based on the real-time flow characteristics. This allowed for a more dynamic simulation and provided insights that wouldn’t be possible with Fluent’s standard functions. The UDF enabled a precision control to simulate the airfoil performance at various angles, leading to an optimized design that performed significantly better than what was initially estimated using the default settings. This illustration shows how UDFs can be crucial for getting accurate, project-specific results that exceed Fluent’s basic functionality.

8. Zella Grimes DDS

Just finished the ‘User-Defined Function (UDF) CFD Simulation Training Course’ and it was fantastic! The breadth of the course coupled with hands-on UDF coding examples really cemented my understanding. Can’t wait to apply these methods in my own simulations.

• MR CFD Support

Thank you so much for your positive feedback! We’re thrilled to hear that the course has been beneficial to you. It’s great knowing that you’re eager to put what you’ve learned into practice. We are always here in case you need any further assistance with your simulations. Good luck!

9. Miss Lea Bashirian

I recently finished the UDF CFD Simulation Training Course and it was excellent. The step-by-step explanations made complex concepts easier to grasp. The variety of chapters covered means that I now feel equipped to customize ANSYS Fluent according to a wide range of scenarios. Particularly, the DeltaT Macro chapter improved my ability to control simulations in dynamic circumstances. Kudos to the MR CFD team for such a wonderful learning resource!

• MR CFD Support

We’re delighted to hear that the User-Defined Function (UDF) CFD Simulation Training Course met your learning needs and that it significantly enhanced your simulation skills! Thank you for recognizing the effort we’ve put into creating a comprehensive and detailed course. Our aim is always to provide high-quality training that empowers our customers. We appreciate your positive feedback!

10. Edmund Skiles

I very much appreciated the balance between theory and practical elements in the User-Defined Function (UDF) CFD Simulation Training Course. The coverage of different macros and their targeted usage has expanded my skill set considerably for complex CFD scenarios.

• MR CFD Support

Thank you for your feedback! We’re thrilled to hear that our training course on UDF in ANSYS Fluent was able to enhance your skills and provide you with a good mix of theoretical and practical knowledge. Your ability to now tackle complex CFD simulations with confidence is exactly what we aim for. We appreciate you choosing our course and are here for any further questions or support you might need.

11. Dr. Graham Kilback

This course sounds incredibly comprehensive. Can you tell me if it includes practical assignments for students to validate their learning by applying UDFs in different scenarios?

• MR CFD Support

Yes, the User-Defined Function (CFD) Simulation Training Course includes practical assignments. These are designed to help students apply the concepts they learn in real CFD scenarios, thereby reinforcing their understanding of writing and applying UDFs in ANSYS Fluent.

12. Raoul Ruecker

I’ve completed the training course and found the content really enlightening. I’m intrigued particularly by how the course detailed the compilation and interpretation of UDFs. I have realized that by deploying the concepts from Chapter5, I can significantly enrich my simulations involving fluid flows in porous media. A big thank you to the instructors for neatly explaining the use cases and implementation details!

• MR CFD Support

We are thrilled to hear that you found our UDF CFD Simulation Training Course enlightening and useful for your simulations. It’s great to know that the explanations and use cases, especially those dealing with fluid flows in porous media from Chapter 5, have enriched your CFD capabilities. We earnestly appreciate your kind words and the time taken to acknowledge our instructors’ efforts. Thank you for choosing our course, and we’re here if you need any further assistance!

13. Tobin Bednar

Thanks to the UDF CFD Simulation Training Course, I can now write custom functions for my complicated simulations. It’s amazing how powerful Fluent becomes with the ability to tailor it to specific needs!

• MR CFD Support

We’re thrilled to hear that our UDF CFD Simulation Training Course has empowered you to create custom solutions for your simulations. Your ability to unlock the full potential of ANSYS Fluent is exactly what we aim for. Thank you for your positive feedback and happy simulating!

14. Prof. Eleanora Gottlieb DDS

The UDF CFD Simulation Training Course provided a detailed view on customizing simulations in ANSYS Fluent! The variety of macros and real-world problem setups to practice on are immensely helpful for practical understanding.

• MR CFD Support

We’re thrilled to hear that you found our ‘User-Defined Function (UDF) CFD Simulation Training Course’ comprehensive and valuable! Thank you for your positive feedback. If you have any further questions or need additional resources, please don’t hesitate to ask.

15. Grace Ullrich

I am truly thrilled with the depth and detail provided in the User-Defined Function (UDF) CFD Simulation Training Course. The organized structure of the curriculum ensures that all key concepts are covered in sequence and with clarity, paving the way for practical implementation in real-world scenarios. This course is definitely a valuable asset for any CFD enthusiast looking to enhance their simulation capabilities with custom functions in ANSYS Fluent.

• MR CFD Support

Thank you so much for your kind words! We are glad to hear that you found the User-Defined Function (UDF) CFD Simulation Training Course to be thorough and beneficial. If you ever have any questions or need further guidance, feel free to reach out to us. Good luck with all your future simulations, and we hope our course continues to support your CFD endeavors!

16. Burdette Gibson

This UDF CFD Simulation course sounds very comprehensive! I’m particularly interested in the Init Macro chapter. Could you tell me more about how this macro is used in the double-pipe heat exchanger simulation?

• MR CFD Support

The Init Macro is used to specify initial conditions for your simulation. In the double-pipe heat exchanger simulation, the Init Macro would be used to set the initial temperature distribution within the computational domain. So, at the start of the simulation, the outer tube will be set to a certain temperature to simulate heating, while the inner tube is set to a different temperature to represent cooling. This provides a starting point for the simulation to proceed with heat transfer analysis.

17. Lola Wisozk

After completing the UDF CFD Simulation training course, will I be able to write my own functions for new and differing scenarios not covered in the syllabus?

• MR CFD Support

Yes, upon completion of the UDF CFD Simulation training course, you should be equipped with the necessary understanding of UDFs in ANSYS Fluent and the skills required to develop and implement your functions for a variety of scenarios beyond those addressed in our course syllabus.

18. Prof. Cassie Kessler

The course seems comprehensive. Could you provide an example of how a UDF has been practically implemented in a CFD simulation within your course material?

• MR CFD Support

In the training course, specific examples include the use of a drag-related UDF when simulating interactions between fluid flow and particles in a spray chamber, and applying source term UDFs to model the momentum variation in the presence of a porous medium. Each practical implementation is thoroughly explained with step-by-step instructions to enable learners to apply UDFs in their own simulations effectively.