Axial Compressor Cfd Simulation

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Axial Compressor CFD Simulation Benchmark

This benchmark project shows a complex CFD analysis of NASA axial compressor Rotor 67

Axial Compressor TCFD NASA Stage67 view interface

TCFD is automated workflow

CFD SUPPORT introduces the new generation of CFD simulations. TCFD brings an extreme increase of productivity to CFD simulations. TCFD is extremely popular project, because it successfully merged benefits of an open-source (perpetual, unlimited users, jobs, and cores, customizable, …) with benefits of commercial codes (professional support, well tested, ready for the industry, robust, accurate, automated, GUI, …).

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TCFD is fully automated, it can run the whole workflow by a single command: data input, new case is written down, mesh is created, case is set-up, case is simulated, results are evaluated and the results report is written down. Both GUI and batch mode. Data in – data out. TCFD is mainly focused on supporting the engineers in their real value added work. TCFD is fully automated and the beauty of TCFD is that it is the user who decides how deep to dive into a CFD or not at all. And all the options remain open at the same time.

The input data

The NASA Rotor 67 axial compressor was simulated. The measurement data is available for results comparison. Rotor has 22 blades – periodic segment of single one blade region is computed. The surface model data in .stl file format together with physical inputs are loaded in TCFD. Other option would be loading an external mesh in OpenFOAM® mesh format, or loading an MSH mesh format (Fluent mesh format). This CFD methodology employs a multi component approach, which means the model is split into a certain number of regions. In TCFD each region can have its own mesh and individual meshes comunicate via interfaces.

Axial Compressor Segment Tutorial Pressure View 8
Axial Compressor Segment Tutorial Pressure View 10
Axial Compressor Segment Tutorial Pressure View 9

Easy to test the mesh sensitivity

In practise the rough mesh with no boundary layer (CPU time: 4 core*hours/single point) can give the same results as the fine mesh with boundary layer (CPU time: 20 core*hour/point). So finally, the rough mesh effect can eliminate the lack of boudary layer. Anyway, with fully automated workflow it is easy to make many tests to callibrate to actual machine.

Axial Compressor TCFD NASA Stage67 view interface 1

The component graph

Any project simulated in TCFD has its component graph. The component graph shows how the components are organized – the model topology. What is the inlet, the outlet and how the components are connected via interfaces.

TCFD axial compressor tutorial component graph

CFD Simulation Set-up

Running CFD Simulation

The simulation can be run on any number of parallel processors. Immediately after the simulation is started, the user can follow the progress of all the important quantities in a HTML report: flow rates, residuals, efficiency, torque, pressure difference and many others. These run-time functions give the user valuable information of the simulation convergence and also the availability to stop the simulation before its expected end.

Axial Compressor Segment Tutorial Residuals
Axial Compressor Segment Tutorial Pressure Ratio

The workflow computes complete characteristics point by point.

Axial Compressor Segment Tutorial Efficiency
Axial Compressor Segment Tutorial Torque

Every simulation performed in TCFD has its report in web responsive .html and pdf format: Axial Compressor Simulation Report Example.

Visual Postprocessing using Turbo Blade Post

The simulation results are examined in ParaView. ParaView is CFD postprocessing tool providing all standard features for analyzing CFD data.

Axial Compressor Segment Tutorial Pressure View 5

CFD Support developed a special extension to ParaView for visual postprocessing rotating machinery: Turbo Blade Post, which is special set of filters for ParaView to enable for example blade-to-blade view, or meridional average. 

Axial Compressor Segment Tutorial Blade To Blade LIC10
Axial Compressor Segment Tutorial Blade To Blade LIC20
Axial Compressor Segment Tutorial Blade To Blade LIC50
Axial Compressor Segment Tutorial Blade To Blade LIC80
Axial Compressor Segment Tutorial Blade To Blade LIC90
Axial Compressor Segment Tutorial Pressure StreamTraces 13
Axial Compressor Segment Tutorial Blade To Blade 27

Blade to blade view. Within the Turbo Blade Post, the impeller mesh can be unwrapped to be able to slice it. The computed quantities are displayed at a certain radial coordinate – anywhere along with the blade height. With such an unwrapped mesh it is also possible to plot all the quantities along the blade height and also plot quantities around the blade surface, etc.



Another Turbo Blade Post function is the Meridional Average which creates a meridional plane of circumferential averages of all simulated quantities.

Axial Compressor Segment Tutorial Pressure Meridional Average 20
Axial Compressor Segment Tutorial Pressure Maridional Average 19

Please contact us for further information.

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