According to the Ansys Learning Forum¹, both CFX and Fluent are good CFD solvers, but they have some differences in their approaches, capabilities, and applications. Some of the main differences are:
- Fluent can handle 2D meshes and polyhedral meshes, while CFX can only handle 3D meshes with tetra and hexa topologies.
- Fluent uses a cell-centered method, while CFX uses a vertex-centered method.
- Fluent needs UDFs for customization, while CFX uses CEL (CFX Expression Language) which is also compatible with CFD-Post.
- Fluent has more tutorials and updates, while CFX has limited resources and development.
- Fluent can use GPU acceleration, while CFX cannot.
For non-Newtonian fluids, boundary layer effects are important. The CFX immersed solid method does not consider boundary layer effects, so it may not be reliable. A Fluent or CFX remeshing method is recommended².
CFX has been proven to be effective for turbomachinery problems, such as centrifugal pumps. Fluent is preferred for high Mach number flows¹.
You can also watch a video tutorial on how to model a centrifugal pump using CFX³.
Source:
(1) What are the differences between CFX and Fluent? - Ansys Learning Forum. https://forum.ansys.com/forums/topic/what-are-the-differences-between-cfx-and-fluent/.
(2) Is CFX or Fluent better for modeling a gear pump that is handling a non .... https://ansyskm.ansys.com/forums/topic/is-cfx-or-fluent-better-for-modeling-a-gear-pump-that-is-handling-a-non-newtonian-fluid/.
(3) #ANSYS CFX - Centrifugal Pump - YouTube. https://www.youtube.com/watch?v=zEfcIT4dt7U.
(4) http://cfd.ninja/.
More info about turbomachinery capabilities in Ansys CFX
CFX is a CFD software that specializes in turbomachinery applications, such as gas turbines, pumps, fans, compressors, and wind turbines. CFX has several features that make it suitable for these types of problems, such as:
- Streamlined turbo setup and post-processing, which allows you to easily define the geometry, boundary conditions, and performance parameters of your turbomachinery model¹.
- Rotor-stator interaction models, which account for the effects of relative motion and fluid exchange between rotating and stationary components².
- Transient blade row methods, which enable you to simulate unsteady phenomena such as blade flutter, stall, and surge with reduced computational cost².
- Highly scalable high-performance computing, which helps you speed up simulations and handle large and complex models².
You can also read some best practice guidelines for turbomachinery CFD³ or watch a video tutorial on how to model a centrifugal pump using CFX.
Source:
(1) Fluid Simulation for Turbomachinery | Ansys CFX - SimuTech Group. https://simutechgroup.com/ansys-software/fluids/ansys-cfx/.
(2) Ansys CFX | Industry-Leading CFD Software. https://www.ansys.com/products/fluids/ansys-cfx.
(3) Best practice guidelines for turbomachinery CFD. https://www.cfd-online.com/Wiki/Best_practice_guidelines_for_turbomachinery_CFD.
Can you recommend some books or courses on turbomachinery modeling?
Some books that you may find useful are:
- Principles of Turbomachinery, 2nd Edition by Seppo A. Korpela¹. This book covers the theory and applications of turbomachinery, including steam turbines, gas turbines, hydraulic turbines, wind turbines, compressors, and pumps. It also provides examples and exercises for each chapter.
- Turbomachinery: Fundamentals, Selection and Preliminary Design by Marco Gambini and Michela Vellini². This book presents a selection of preliminary sizing procedures for turbomachinery, using geometric correlations and losses models. It also examines all types of turbomachines, such as axial and radial turbines, axial and centrifugal compressors, and centrifugal pumps.
- Fundamentals of Turbomachinery by William W. Peng³. This book provides a comprehensive introduction to turbomachines and their applications, with up-to-date coverage of all types of turbomachinery. It also includes numerous examples, problems, and case studies.
Some courses that you may find helpful are:
- Introduction to Turbomachinery by MIT OpenCourseWare. This course introduces the basic concepts and principles of turbomachinery, such as thermodynamics, fluid mechanics, performance analysis, and design. It also covers various types of turbomachines, such as axial and radial flow turbines and compressors, and pumps and fans.
- Turbomachinery Aerodynamics by edX. This course covers the aerodynamics of turbomachinery, such as flow phenomena, losses, blade design, and optimization. It also includes applications to gas turbines, steam turbines, wind turbines, and propellers.
- Turbomachinery and Propulsion by Coursera. This course covers the fundamentals of turbomachinery and propulsion, such as thermodynamics, fluid dynamics, performance, and efficiency. It also includes topics such as combustion, turbojets, turbofans, turboprops, and rockets.
Source:
(1) Principles of Turbomachinery, 2nd Edition | Wiley. https://www.wiley.com/en-us/Principles+of+Turbomachinery%2C+2nd+Edition-p-9781119518099.
(2) Turbomachinery: Fundamentals, Selection and Preliminary Design .... https://link.springer.com/book/10.1007/978-3-030-51299-6.
(3) Fundamentals of Turbomachinery | Wiley. https://www.wiley.com/en-us/Fundamentals+of+Turbomachinery-p-9780470124222.
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