Rotating Machinery
CFX software has been used for rotating machinery analysis for almost 20 years. The ANSYS CFX product builds on this background by continuing to provide state-of-the-art CFD solutions for a variety of applications such as pumps, compressors, fans, turbines, propellers, impellers, diffusers, stators, vanes, etc. Numerical models are provided for multiple frames of reference and pitch change, accurate discretization for swirling flows, and steady and transient rotor-stator interaction.
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ANSYS CFX CFD software is able to model a wide variety of turbomachines. |
Velocity vectors at midspan for a pico-propeller turbine. Image courtesy Nottingham Trent University. |
Specialized turbomachinery pre and post-processing ease repetitive tasks. All the expected tools and paradigms required in the rotating machinery industry are provided.
ANSYS CFX aims to be the leading commercial CFD package for rotating machinery design and analysis.
ANSYS CFX delivers a robust, well-validated cavitation model to further solidify leadership in CFD analysis of rotating machinery.
Robust Cavitation Modeling
ANSYS CFX software offers a particularly efficient approach to simulate systems with both stationary and rotating components. With the general multiple frame of reference capability, steady-state analyses are performed of the various elements of the equipment, using local reference frames which are stationary or rotating as appropriate. These reference frames are joined together by a frame change model. ANSYS CFX offers three powerful frame change model, each having its own advantages. Within the same computation, the different models can be combined at different interfaces.
The Transient rotor/stator capability resolves the true transient interaction between components for maximum accuracy. It can be applied to individual pairs of blade passages or to the entire 360 degree machine. Setup and use is as simple as with the other frame change models and it is even possible to combine transient and steady-state frame change interfaces in the same computation. Complementing this is the inclusion of second-order time differencing which delivers greater transient accuracy.
The Stage interface model is a simpler model, which provides faster solutions than the full Transient Rotor-Stator model. It enables a steady state computation to be used by performing circumferential averaging of the variables at the interface.
Another way to model the interaction of rotating and stationary parts is with ANSYS CFX software's frozen-rotor model, which is useful when the circumferential flow variation that each blade passage experiences is large during a full revolution. With this option, computations are again performed in a steady-state mode, based on the assumption of quasi-steady flow around the rotating component at every rotation angle. The additional rotational effects (coriolis and centrifugal terms) are included in the rotating regions, and the frame change across the sliding interface is accommodated automatically when linking the different regions of the solution.
For more information on ANSYS products, features and capabilities for the turbomachinery industry, please visit Turbomachinery Industry.