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Impulse theory and small-scale blades

Posted May 26, 2015 at 07:37 by skeptik (CFD notes)

Very simple, very reliable impulse theory applied to small scale rotors, quad's alike, seems to be very promising.

Espesially at low velocities.

The data about propeller were obtained in thesis Isa Diana de Sousa Baptista Morais Carvalho "Low Reynolds Propellers for Increased Quadcopters Endurance",
the experimental data scrached from http://m-selig.ae.illinois.edu/props/propDB.html

Sure, it can be more precise but i've only used classical work...
Attached Images
File Type: jpg exp-calc-kt3000-cp.jpg (40.7 KB, 463 views)
File Type: jpg exp-calc-kt3000-ct.jpg (38.0 KB, 448 views)
File Type: jpg exp-calc-kt3000-etha.jpg (36.9 KB, 463 views)
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Generating Surface Stream Lines with Paraview (From 3D data)

Posted May 26, 2015 at 05:18 by Mehar

Being a Newbie, I have struggled to add surface streamlines to a slice, as I cannot find Appropriate instructions on this...However, after a long time struggle, I am able to add surface streamlines to a slice, which I would like to share with other newbies to avoid that head ace!

Following is the step by step procedure for generating surface streamlines!

1. Load Your Data in paraview
2. Add Slice filter to your Loaded Data
3. Add SurfaceVector filter...
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A semi-analytical extension of the Reichardt wall law to pressure gradient effects

Posted April 17, 2015 at 07:40 by sbaffini (NuTBox)

I recently worked on wall functions, especially those based on simplified 1D numerical integration (e.g., http://link.springer.com/chapter/10....-642-14243-7_7) and i found a relatively simple, analytical, formulation that takes into account pressure gradient effects.

In practice, this is an extension of the Reichardt wall law to pressure gradient effects.

It is semi-analytical because it takes as assumption that the base Reichardt law is an exact solution of the...
Attached Files
File Type: pdf wallf.pdf (36.5 KB, 117 views)
File Type: txt wallfn.txt (1.2 KB, 53 views)
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Rating: 2 votes, 5.00 average.

Building OpenFOAM 2.3.x on centOS 6.6

Posted March 23, 2015 at 19:22 by donQi
Updated March 24, 2015 at 03:22 by donQi

I was following the instructions from
http://www.openfoam.org/download/git.php
to install the Repository Release Version 2.3.x on a centOS 6.6 machine.

But even after installing all the dependency packages written in the above link, I was getting the following error
Code:
  /usr/bin/ld: cannot find -lz
   collect2: error: ld returned 1 exit status
   make[2]: *** [dummysizes] Error 1
SOLUTION :
The problem with -lz will be solved by installing...
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Rating: 2 votes, 4.00 average.

Propeller blade tips shape and Q

Posted March 19, 2015 at 05:01 by skeptik (CFD notes)

Red - baseline (right on Q-comparation image)
Grey - advanced tip (left on Q-comparation image)

Name:  blade-tips.jpg
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Name:  t065-Q-comp.jpg
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