Boundary Element Method Output Files Conversion

AI Thread Summary
The discussion centers on converting Boundary Element Method (BEM) output files for calculating sound pressure using the formula p=(rho)*(velocity potential). The user is unfamiliar with the scientific notation format (e.g., 1.58625295E-06), which represents numbers in exponential form, indicating a value of 1.58625295 x 10^-6. It is clarified that this format is standard for data with a wide range of values and can be easily read by software designed for scientific data. Additionally, the conversation mentions programming formats in Fortran and C that handle this notation. Understanding this format is essential for accurate calculations in BEM analysis.
altgenn
Messages
2
Reaction score
0
Hi there,

I have completed my analysis in BEM. The results gives me velocity potential in form of

37954305E-04 +1.58625295E-06 +2.10275811E-07 +...

I have real scattering values, imaginary and absolute scattering values in this form.

I am new to the method and from a different major, so my question may look silly.
In order to calculate the sound pressure, I have p=(rho)*(velocity potential) equation. (rho) is the density of the medium.

I do not know the format 0.0000E+00. What is it equal to? How may I convert it to calculate the equation?

Thanks.

A.
 
Last edited:
Engineering news on Phys.org
This is the standard format for data where you want a fixed number of significant figures, but the numbers have a wide range.

+1.58625295E-06 means +1.58625295 x 10^-6

Software that is mean to read "scientific" data files will read and write this format automatically. Check out E, F, and G formats in Fortran, %e, %f and %g formats in C, and similar things in other languages.
 
Thank you very much.
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'
Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Back
Top