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Old   April 26, 2011, 02:13
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Hello All,
I am fresher to CFD analysis and especially to CFX and need help understanding the basic process. I have gone through the tutorial but still need help with this specific case.So, your help would kick start my attempt.

My problem consist of an inlet nozzle and expander(impeller).

Question 1.

1. One Component

Is it possible to vary the inlet flow direction if I am using only the impeller.
Please see attached "One component".
If possible please let me know in detail how.

2. Two Components

I have modelled the nozzle and impeller in bladegen which generates a fluid zone before and after the bladed portion. I have brought in these two geometries as shown attached. I have offset the nozzle and impeller on purpose for your clear view.

Is this correct approach? Should the fluid zones overlap as shown or they should not?

Thank you,
Karmavatar
Attached Images
File Type: jpg One component.JPG (22.1 KB, 6 views)
File Type: jpg Two component.JPG (54.2 KB, 7 views)
File Type: jpg Fluid Zone.JPG (93.9 KB, 6 views)

Last edited by karmavatar; April 26, 2011 at 02:14. Reason: Added sentence
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Old   April 26, 2011, 22:23
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Glenn Horrocks
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You can specify inlet fluid velocity in the boundary condition tab.

Fluid volume domains should not overlap, but interfaces joining domains should overlap. I am not sure what you are askign here.
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Old   April 26, 2011, 23:59
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Glenn,
Thank you for your response and answering my second question.

For my first question, is it possible to have inlet flow direction say 20 degrees, 30 degrees other than "normal to boundary" ?

Karmavatar
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Old   April 27, 2011, 00:07
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You can specify the inlet velocity as XYZ components in either cartesian or cylindrical coordinates. This should do what you want.
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Old   April 29, 2011, 21:40
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I chose cylindrical coordinates (a,r,t).

Intial setting was 1,0,0.

I assumed that these go from 0 to 1, so I set 0.8, 0, 0 to get a different inlet angle.

Is this how we set the angle? 'cause when I ran the solver it crashed.

Thanks
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