CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   tutorial for CFD & acoustic analysis ansys workbench 11 (http://www.cfd-online.com/Forums/cfx/64786-tutorial-cfd-acoustic-analysis-ansys-workbench-11-a.html)

badterojan May 24, 2009 14:24

tutorial for CFD & acoustic analysis ansys workbench 11
 
Hi

I need tutorial for CFD & modal (acoustic) analysis ansys workbench 11.0
"in English"

please help

please help

thanks

ghorrocks May 24, 2009 19:37

Hi,

CFX cannot do modal analysis, if you mean calculations in the frequency domain. In CFX you have to do transient simulations and back out frequency data from that. Or do you mean aerodynamically generated noise calculated in CFX which gets coupled to an acoustic solver to get far-field conditions?

Glenn Horrocks

badterojan May 27, 2009 15:50

Quote:

Originally Posted by ghorrocks (Post 217039)
Hi,

CFX cannot do modal analysis, if you mean calculations in the frequency domain. In CFX you have to do transient simulations and back out frequency data from that. Or do you mean aerodynamically generated noise calculated in CFX which gets coupled to an acoustic solver to get far-field conditions?

Glenn Horrocks

hi
I mean a Cfd toturial & a acoustic toturial
not coupled

ghorrocks May 27, 2009 19:36

Hi,

I don't think you will find tutorials on what you are looking for. You will have to go to the literature.

So do you mean just the noise generation effects (ie the CFD stuff), and you are not worried about the far-field noise levels? In this case you will need to go down the path of LES, DES or SAS. These are all quite advanced topics and you won't find much in the way of tutorials to help you.

Glenn Horrocks

lofty May 28, 2009 05:11

Quote:

Originally Posted by badterojan (Post 217348)
hi
I mean a Cfd toturial & a acoustic toturial
not coupled

Can you explain what kind of acoustic problems you want to run in CFX. I am also working on acoustic simulations. Glenn is right you will not find acoustic tutorials in documentations. Also CFX will give you results in time domain and in order to covert them into frequency domain you will have to do fft in matlab or some other software that you like.

badterojan May 29, 2009 00:51

Quote:

Originally Posted by lofty (Post 217395)
Can you explain what kind of acoustic problems you want to run in CFX. I am also working on acoustic simulations. Glenn is right you will not find acoustic tutorials in documentations. Also CFX will give you results in time domain and in order to covert them into frequency domain you will have to do fft in matlab or some other software that you like.


Hi

give up cfx and cfd and any thing else about it at this time.

I am working on a acoustic project which I have to fine modal analysis.
I want to find solution combination of modal (e.g. show the first vibration
mode on X axle and second vibration mode on Y axle altogether).

Is that possible to do it in workbench?

please help..

ghorrocks May 31, 2009 19:20

Hi,

If you are trying to do modal analysis on an axle assembly then why are you thinking of CFX at all? Isn't this a FEA thing so you need ANSYS Mechanical or similar?

Glenn Horrocks

ehrenwirth June 2, 2009 09:58

Hi badterojan!

GHorrocks is right, u canīt do this with ansys cfx! You can do this with ANSYS Mechanical for example. I have good experiences with the Programm "FEMAP". You can purchase a free 300-Node Version of this programm under:

http://www.plm.automation.siemens.co...elocity/femap/

But remember you only have 300 Nodes! Or you get the 30-days-full-Version (same link). Here is a tutorial for a modal-analysis with femap under:

http://www.smart-fem.de/media/smart/...tiff_plate.pdf

Bye

irina December 4, 2009 11:57

Hi there, I'm interested how it is possible to investigate ultrasonic propagation in flow meter or just in water pipe with ANSYS. Maybe someone knows tutorials which describe solving of this problem. Unfortunately I couldn't find information about ANSYS applcation in ultrasonic flow metering

ghorrocks December 5, 2009 06:01

What exactly are you trying to model? The propogation of the acoustic waves themselves, including the reflections off the bubbles? I don't think CFX is a good tool for this type of model, a dedicated acoustics simulation package will work much better.

irina December 7, 2009 05:26

I would like to to examine the effect of flow turbulence on sound waves propagating across a velocity field inside flow meter's duct. If CFX is not a good tool maybe you know a really good tool for such investigations. Actually I want to find the way for increasing the accuracy of an ultrasonic flowmeter


ghorrocks December 7, 2009 05:37

This is a pretty tricky piece of modelling. CFX will be able to do it but the simulations are going to be very big and take ages to run.

Have a look at SYSNOISE. I don't know if it can do all the physics you will need but if it can it will be much faster than CFX. Also do a google search, there are lots of packages out there. But I can guarantee CFX has the necessary physics to model it - the question is whether the simulation will finish before the next millennium.

irina December 7, 2009 05:55

Thanks for your advice. Actually I conducted a lot of researches in FLUENT but it was applied to hydrodynamics inside metering cell only.

steel July 26, 2010 22:58

please help me !!
 
Can any one help me to model this satellite using Femap, Step by step instructions would be greatly appreciated !! in the link below you can see a picture of it but if not any satellite would work too, Please help me!!!

http://www.scribd.com/doc/13083827/tmgfprim

Greatly appreciate all the help!!!

ghorrocks July 27, 2010 07:17

Why do you expect to get any help with a Femap simulation when this is a CFX forum?

grippen May 6, 2013 15:31

Quote:

Originally Posted by irina (Post 238930)
I would like to to examine the effect of flow turbulence on sound waves propagating across a velocity field inside flow meter's duct. If CFX is not a good tool maybe you know a really good tool for such investigations. Actually I want to find the way for increasing the accuracy of an ultrasonic flowmeter


hi Irina,

I'm looking for an solution to. Did you find an satisfying way to simulate the ultrasonic waves in water flow?

grippen May 6, 2013 15:37

Quote:

Originally Posted by grippen (Post 425640)
hi Irina,

I'm looking for an solution to. Did you find an satisfying way to simulate the ultrasonic waves in water flow?

I'm looking for an solution to. Did you find an satisfying way to simulate the ultrasonic waves in water flow?

ghorrocks May 6, 2013 18:55

CFX can model acoustic waves just fine, just use a compressible fluid model. But depending on what you are trying to do this might not be appropriate. If you describe what you are trying to do we might be able to help you.

kkboy1 February 23, 2015 22:51

My project is on ultrasonic cleaning. I need to find out what is the optimum ultrasonic frequency that can penetrate the membrane which is to be cleaned.

Can CFX do this?

First I need to determine acoustics frequency that can generate the required size bubbles(cavitation) which can penetrate through the membrane.

How can I do this in CFX?

Thank you.

ghorrocks February 24, 2015 01:58

If my task was to find the ultrasonic frequency which cleaned best I would just get a variable frequency ultrasonic source and sweep a range of frequencies and measure which cleaned best. Sounds quick and easy to me compared to doing a simulation of it. This would be a very difficult simulation to get accurate.


All times are GMT -4. The time now is 15:10.