Dear Experts,
In a rectangular bubble column I need to calculate plume oscillation time. How to run this model in Fluent ANSYS ? If there is a tutorial type of guideline please share with me. Any type of guide line would be highly appreciated.. Regards..
You can plot frequency in cfd post by inserting chart selecting transient option in chart details and then checking FFT and then selecting file input. you have to make a csv input file containing two columns the time (in sec)and your variable of interest without any column title or text. Select frequency for x axis tab and magnitude for y axis tab. You can read the frequency value at the peak of plot. This will be the frequency of oscillation and its reciprocal is time period of oscillation.
No tlikely to find a tutorial - unless you are very lucky - try running out time data and do a simple FFT using any standard FFT code - NAG etc..
You can plot frequency in cfd post by inserting chart selecting transient option in chart details and then checking FFT and then selecting file input. you have to make a csv input file containing two columns the time (in sec)and your variable of interest without any column title or text. Select frequency for x axis tab and magnitude for y axis tab. You can read the frequency value at the peak of plot. This will be the frequency of oscillation and its reciprocal is time period of oscillation.
You need to make sure you data is in units of 2 to the nth power or pad it with zeros to bring it to the next highest number, 64, 128 etc.. Read Brighams excellent book
Thank you very much for your key guidance, Mr. Abu Bakar Izhar and Dr. John Nichols..
Dear Muhammad,
I want to apply FFT on time series pressure and axial velocity of a specified point in my transient simulation. but i cant find how to save the velocity vs time for this point in fluent.
I would appreciate it if you could help me with your response.
thanks a lot
Dear Moein Siadaty,
In fluent software, apply acoustic model for time series pressure at specified point and finally get FFT plot ... please read manuals
Good Luck
Dea Muhammad
I don't know even you have got the key answer or not.
But to gain to a systematic answer,enclosed please find the file that teaches how to produce data files to make the fft file in post processing step.
enjoy it.
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