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Old   April 28, 2021, 16:01
Default CFD-Post results analysis
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I have simulated a radial compressor within ANSYS by firstly using VISTA CCD and consequently transferring the data into Turbomachinery Fluid Flow. Here, BladeGen creates the 3-D model of the radial compressor, turbogrid creates the mesh and finally CFX provides the results.

My question is regarding some of the different results that CFD-post automatically generates and wanted to know whats the difference between them. The attached pictures are below. What would be the difference between these 3? (Span 10,50,90 view)

Also, what do you think of these results? These gave an isentropic efficiency of 86% and a pressure ratio of 4.7 overall but I want to understand whether these velocity distributions along the suction and pressure side are reasonable or they do not look efficient.

I will also add a blade-to-blade view image in case its required.

Thanks in advance

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Old   April 28, 2021, 18:41
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Please post images directly on the forum. Do not use third party sites. See FAQ:

About accuracy, see FAQ:

On interpreting your results - I have no idea what you are modelling, what conditions you are modelling or what the images show. This means I cannot make any useful comment about what your results are.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
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Old   April 29, 2021, 05:20
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Sorry I should have been clearer with my modelling.

I am trying to design a radial compressor that achieves a reasonable isentropic efficiency. The specifications added to Vista CCD are the following:

Duty and Aerodynamic Data Tab
Overall Pressure ratio :4.5
Mass flow rate : 0.2 kg/s
Rotational Speed : 150000 rpm
Temperature inlet:293.15K
Pressure : 101000 Pa
Isentropic Efficiency: 0.8
(Everything else left default)

Geometry Tab
Hub diameter : 20 mm
Shroud Diameter : Optimized diameter
Number of vanes : 7 (for both main vane and intervane)
(Everything else left default)

After setting up Vista CCD, I transferred the data into Turbomachinery Fluid Flow which is a pre-built program within ANSYS that automatically generates the mesh using Turbogrid (it is a hexahedral mesh with 250000 total nodes), consequently, it uses CFX to set the parameters for simulation and finally the results are obtained on CFD-Post. The results I have shown you are obtained within CFD-Post and there are different tabs that are automatically generated. However, I was not sure why there are 3 different types of results (Span 10/50/90) and wanted to know what these referred to.

If you need anything else in particular to continue please let me know. Also, do you need me to re-submit the images or can you use those links?
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