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New Member
Herren Thomas D'Souza
Join Date: Jan 2021
Posts: 2
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Greeting CFD'ians
I was running laminar, transient pressure-based CFD simulations on a rocket combustion chamber to capture the pressure oscillations due to Obstacle Vortex Shedding using a segregated PISO algorithm in Fluent. I am recording the vertex average of the static pressure from a virtual sensor and I am able to capture the resonating frequencies when I do the FFT in the fluent itself with PSD. However, when I look at my reference research paper, they consider something which I cannot comprehend (maybe I'm not thinking). They consider Prms/Pmean as the y-axis. (I've attached the image of the graph) I wanted to know, how is Prms calculated and how to obtain the values to plot the graph like the one which I've attached. I don't know if Fluent can capture the Prms. pressure_graph.png It'd be a great if anyone help me understand these, "The study of the frequency response of the pressure oscillation data is based on a spectral analysis conducted by means of the FFT" The amplitude of the pressure oscillations is usually evaluated by means of: ![]() where the discretized frequency ![]() ![]() |
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Tags |
fft, fluent, pressure, psd analysis, rms |
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Thread | Thread Starter | Forum | Replies | Last Post |
Partitioning Error on HPC: ***Cannot bisect a graph with 0 vertices! | MJM | FLUENT | 0 | November 28, 2019 05:21 |
How is total pressure calculated? | looee | CFX | 15 | October 30, 2019 08:14 |
Pressure Outlet Guage pressure | Mohsin | FLUENT | 36 | April 29, 2016 17:16 |
Pressure BC for combustion chamber | Giuki | FLUENT | 1 | July 19, 2011 11:35 |
converting unsteady pressure data to soun pressure level graph | vasuaero1988 | FLUENT | 0 | November 21, 2010 10:51 |