User Defined Function

Project Outsourcing

Outsource your project to the MR CFD simulation engineering team. Our experts are ready to carry out every CFD project in all related engineering fields. Our services include industrial and academic purposes, considering the ANSYS Fluent software's wide range of CFD simulations. By outsourcing your project, you can benefit from MR CFD's primary services, including Consultation, Training, and CFD Simulation. The project freelancing procedure is as follows:


An official contract will be set based on your project description and details.


As we start your project, you will have access to our Portal to track its progress.


You will receive the project's resource files after you confirm the final report.


Finally, you will receive a comprehensive training video and technical support.

What are User Defined Functions (UDF)?

A user-defined function, or UDF, is a function that you program that can be dynamically loaded with the ANSYS FLUENT solver to enhance the standard features of the code. For example, you can use a UDF to define your boundary conditions, material properties, and source terms for your flow regime and specify customized model parameters (e.g., DPM, multiphase models) and initialize a solution, or enhance post-processing.

UDFs are written in the C programming language using any text editor, and the source code file is saved with a .c extension (e.g., myudf. c). One source file can contain a single UDF or multiple UDFs, and you can define multiple source files.

UDFs are defined using DEFINE macros provided by ANSYS FLUENT. They are coded using additional macros and functions also supplied by ANSYS FLUENT that access ANSYS FLUENT solver data and perform other tasks.

Every UDF must contain the UDF.h file inclusion directive (#include “UDF.h”) at the beginning of the source code file, which allows definitions of DEFINE macros and other ANSYS FLUENT-provided macros and functions to be included during the compilation process. Note that values passed to a solver by a UDF or returned by the solver to a UDF are specified in SI units.

Source files containing UDFs can be either interpreted or compiled in ANSYS FLUENT. For interpreted UDFs, source files are interpreted and loaded directly at runtime in a single-step process. For compiled UDFs, the process involves two separate steps. A shared object code library is first built, and then it is loaded into ANSYS FLUENT. After being interpreted or compiled, UDFs will become visible and selectable in ANSYS FLUENT dialog boxes and can be hooked to a solver by choosing the function name in the appropriate dialog box.

In summary, UDFs:

  • are written in the C programming language.
  • Must have an include statement for the UDF.h file.
  • Must be defined using DEFINE macros supplied by ANSYS FLUENT    utilize predefined macros and functions supplied by ANSYS FLUENT to access ANSYS FLUENT solver data and perform other tasks.
  • Are executed as interpreted or compiled functions.
  • Are hooked to an ANSYS FLUENT solver using a graphical user interface dialog box.
  • Use and return values specified in SI units.

MR-CFD, an expert in the field of CFD simulations using UDF

With several years of experience simulating a wide range of problems in various CFD fields using Fluent software, the MR-CFD team is ready to offer extensive modeling, meshing, and simulation services. The MR-CFD team is an expert in developing C codes for enhancing the features implemented inside the ANSYS Fluent software (udf) to perform your fundamental projects that are impossible to execute using the default Fluent solvers.

Our services are not limited to the mentioned subjects. The MR-CFD team is ready to undertake different and challenging projects—in which UDFs should be implemented—ordered by our customers. You can consult with our experts freely and without charge at first, and then order your project by sending the problem details to us using the following address.

[email protected]

By entrusting your project to the MR-CFD team, you will not only receive the related project’s files (Geometry, Mesh, Fluent files). Also, you will be provided with an extensive tutorial video demonstrating how you can create the geometry, mesh, and define the needed settings in the Fluent software all by yourself. And these all come with post-technical support from the MR-CFD team.

MR-CFD experts are ready to fulfill every Computational Fluid Dynamic (CFD) needs. Our service includes industrial and academic purposes considering a wide range of CFD problems. MR-CFD serves in three main categories: ANSYS Fluent Consultation, ANSYS Fluent Training, and ANSYS Fluent Project Simulation. MR-CFD company has gathered experts from various engineering fields to ensure the quality of CFD services. Your CFD project would be done in the shortest time, with the highest quality and reasonable cost.


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