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Search: Posts Made By: Josh
Forum: CFX August 5, 2009, 09:16
Replies: 35
Views: 6,602
Posted By Josh
Thanks Glenn. I did some tests and it looks...

Thanks Glenn. I did some tests and it looks pretty damn accurate.

Thanks to everyone who helped.
Forum: CFX August 4, 2009, 09:20
Replies: 35
Views: 6,602
Posted By Josh
I'm asking if the interface (between the rotating...

I'm asking if the interface (between the rotating fluid domain around the airfoil and the stationary rectangular prism fluid domain) will affect certain parameters (e.g. the pressure distribution).
...
Forum: CFX July 31, 2009, 10:43
Replies: 35
Views: 6,602
Posted By Josh
Hey guys - Thanks for everything. The...

Hey guys -

Thanks for everything. The simulation worked well.

I'm just curious ... how much will the rotating fluid-fluid domain affect the results on the airfoil? Is it relatively...
Forum: CFX July 30, 2009, 15:28
Replies: 35
Views: 6,602
Posted By Josh
Thank you for your help and patience, George and...

Thank you for your help and patience, George and Glenn.

I understand it's frustrating to help those who are simply looking for a quick answer without putting in any effort. I have worked on this...
Forum: CFX July 30, 2009, 12:26
Replies: 35
Views: 6,602
Posted By Josh
I tried to complete all of them. There are...

I tried to complete all of them. There are certain files that, for whatever reason, were missing, so I was not able to complete all of them. I was, however, able to create each of the geometries...
Forum: CFX July 30, 2009, 10:36
Replies: 35
Views: 6,602
Posted By Josh
I do not want to treat the wing mesh as part of...

I do not want to treat the wing mesh as part of my simulation. I am unsure of why this occurs, but I want to stop it.



What do you mean "in the same part in workbench"? Do you mean that, in...
Forum: CFX July 30, 2009, 10:03
Replies: 35
Views: 6,602
Posted By Josh
Correct. The cylindrical domain is an Extrusion...

Correct. The cylindrical domain is an Extrusion with the "Add Frozen" Operation option. If I just do an Extrusion with the "Cut Material" option, the cylindrical domain does get cut out, but so...
Forum: CFX July 29, 2009, 13:32
Replies: 35
Views: 6,602
Posted By Josh
Update: I ran it rotor-stator style with no...

Update:

I ran it rotor-stator style with no pitch change and GGI connectivity.

It's running, but ...

For some reason, the airfoil cutout is not moving with the moving domain. Here are some...
Forum: CFX July 29, 2009, 12:57
Replies: 35
Views: 6,602
Posted By Josh
Recently, I have been using this thread...

Recently, I have been using this thread (http://www.cfd-online.com/Forums/cfx/63515-2d-rotating-ellipse-domain-interface.html) to model my problem.

Glenn - you mentioned in that thread to use 2...
Forum: CFX July 28, 2009, 09:19
Replies: 35
Views: 6,602
Posted By Josh
Ouch. Careful - he reads these boards, too!

Ouch. Careful - he reads these boards, too!
Forum: CFX July 27, 2009, 09:22
Replies: 35
Views: 6,602
Posted By Josh
I asked my professor about this on Friday. Just...

I asked my professor about this on Friday. Just as with a flat plate, the turbulence model is required near the trailing edge of the airfoil where length begins to play a significant role in...
Forum: CFX July 24, 2009, 11:14
Replies: 35
Views: 6,602
Posted By Josh
I want to do the stationary/rotating frame style....

I want to do the stationary/rotating frame style. When using 2 domains, though, my airfoil appears as both a domain AND as a boundary within the fluid domain. Any ideas on how to prevent this?
Forum: CFX July 24, 2009, 10:29
Replies: 35
Views: 6,602
Posted By Josh
This is very low because I am modeling a low...

This is very low because I am modeling a low Reynolds UAV. Despite the likelihood of laminar flow, the professor and client requested k-omega turbulence modeling. They are interested in Reynolds...
Forum: CFX July 24, 2009, 09:55
Replies: 35
Views: 6,602
Posted By Josh
What if I don't use an immersed solid? Like...

What if I don't use an immersed solid? Like Glenn said, that's a poor way to model airfoils, so I decided against it. If I don't use an immersed solid, should I still have 2 domains (solid airfoil...
Forum: CFX July 23, 2009, 16:21
Replies: 35
Views: 6,602
Posted By Josh
I tried Glenn's method (2 Domains - the solid...

I tried Glenn's method (2 Domains - the solid airfoil and the fluid surroundings). In Post, I only saw rotation if the airfoil domain was treated as an immersed solid. Even then, as the airfoil...
Forum: CFX July 23, 2009, 15:33
Replies: 35
Views: 6,602
Posted By Josh
Thanks for the drawing, George. I do understand...

Thanks for the drawing, George. I do understand the theory, just not the method. I'm not sure how to rotate the area around the airfoil.
Forum: CFX July 23, 2009, 11:53
Replies: 35
Views: 6,602
Posted By Josh
I have searched up and down through the Help file...

I have searched up and down through the Help file and online for a way to do this for objects that aren't actually rotor/stators. The tutorial was unhelpful as it was based on a pre-existing...
Forum: CFX July 23, 2009, 10:45
Replies: 35
Views: 6,602
Posted By Josh
Thanks for the replies. Here are some...

Thanks for the replies.

Here are some details ...

Geometry

I did model the airfoil as a cutout from the fluid domain. I used "Point" to import my airfoil, created a spline of half the...
Forum: CFX July 22, 2009, 15:18
Replies: 35
Views: 6,602
Posted By Josh
Update

Hello -

I managed to run the airfoil simulation with a changing angle of attack. I changed the airfoil from a "Solid" to an "Immersed Solid". The animation now produces a moving airfoil. My...
Forum: CFX July 22, 2009, 12:43
Replies: 35
Views: 6,602
Posted By Josh
Transient Angle of Attack Simulation Not Displaying in Post

Hello -

Before I begin, I have read the manual and have done all of the tutorials.

I am running a 2-dimensional (2-D Extruded Mesh) simulation of a NACA 0012 airfoil. I used the "Flow from a...
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