CAE Software for Preliminary Design


CAE Software for Radial Compressors

2020 Software Release Highlight: Aungier Model Calibration

In 2019, the Aungier model was added to COMPAL®, our compressor meanline design and analysis product. The Aungier model is a globally accepted, physics-based loss approach to aid in the design of compressors.

Our development team has re-visited this implementation in 2020 by improving the model’s calibration using an expanded set of test data, which includes a wider range of design requirements and applications. In doing so, using this model will allow a designer to determine the size and performance of their compressor design with a higher level of confidence.

COMPAL - Aungier Promo 9.21.2020


A meanline approach is used to rapidly design and analyze radial and mixed-flow compressors for single or for multiple stages. COMPAL® is used to design the compressor stage, analyze performance, refine parameters with data reduction, and model the machine according to a number of performance models. COMPAL's unique Design Wizard leads the user through all the necessary steps for design, analysis, and data reduction. The meanline compressor design can easily be sent to the AxCent® program for further blade design and fluid dynamic analysis.

Components Supported by COMPAL:

  • Upstream/downstream elements
  • Radial or axial inlet guide vanes
  • Open or closed impellers
  • 2D or 3D impellers
  • Front and rear seals
  • Diffuser types, including…
    • Arbitrary vaned
    • Vaneless
    • Wedge/channel
    • Cascade
    • Conical
    • 90/180 degree bends
  • Exit elements, including…
    • Collector
    • Volute
    • Return channel
    • Deswirl
    • Continuous crossover
    • Various leakage paths
    • Multistage compressors


COMPAL supports two-elements-in-series (TEIS) rotor diffusion modeling through a two-zone loss modeling approach, disk friction, exit mixing, radial and axial stator diffusion/losses, volutes, inducer choke, stall, thrust, and other fundamental fluid dynamic aspects of compressor performance. Many alternative models are also available.

Integrated Performance Map Plotting

Review design performance, analysis, and test data with flexibly plotted performance maps, updated automatically with each geometric change.

Easy Editing

View the compressor stage in an active, true-scale meridional view. Edit the parameters by double clicking on the component in the meridional view. Also, edit parameters using a single text input/output file, a feature especially useful for optimization.

Tabular View of Results

View the results in a flexible, spreadsheet-like table, customizable through separate filters. Create any number of filters, select what to display, and customize the labels as well.

Axial View with Velocity Triangles

View blades and velocity triangles at the impeller inlet and exit in a window view. View inlet velocity triangles for the hub, tip, or RMS radius, and exit velocity triangles for the primary and secondary zones, and mixed-out state.

OLE Automation Support

Control COMPAL from an external program through industry-standard Object Linking and Embedding (OLE) automation. OLE automation supports full control of data entry, program execution, and result retrieval. External programs can be written in Visual Basic, C++, FORTRAN, or any other language that supports the Microsoft® OLE standard.

Multistage Capability

COMPAL supports multistage analysis and data reduction, and provides a variety of multistage performance maps.

A Real Fluid Program

COMPAL calculates Real Fluid properties using optional DB Robinson Real Fluid Properties, NIST, or ASME Steam routines. Users can also incorporate their own proprietary fluid properties.

Direct Integration with AxCent®

AxCent can start automatically from within COMPAL, with the initial geometry transferred automatically to AxCent. Changes in AxCent that affect the meanline analysis will cause the meanline analysis to be rerun and all performance maps to be regenerated.

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COMPAL and AxCENT are registered trademarks of Concepts NREC, LLC. Microsoft is a registered trademark of Microsoft Corporation.