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Constant eps
Posted 2015年8月11日 GMT-4 23:08 Fluid & Heat, Computational Fluid Dynamics (CFD) 2 Replies
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Greetings,
What does constant eps do when it is added to the source term (f) of a PDE? Does it help convergence?
Thanks.
Eric
What does constant eps do when it is added to the source term (f) of a PDE? Does it help convergence?
Thanks.
Eric
2 Replies Last Post 2015年8月12日 GMT-4 13:57
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Posted:
9 years ago
eps is sometimes needed to prevent error messages if a variable is raised to a non-integer power (like square root). As far as I know it does not do anything else.
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Posted:
9 years ago
Hi
"eps" is the smallest real number that added to "1.0" can be distinguished from "1.0" by the binary representation of a floating point real numbers.
It's a "clean" programming trick to avoid divisions by "0" mostly ... and is required only because the binary representation of Real number is very sparse and is limited in absolute and relative precision
--
Good luck
Ivar
"eps" is the smallest real number that added to "1.0" can be distinguished from "1.0" by the binary representation of a floating point real numbers.
It's a "clean" programming trick to avoid divisions by "0" mostly ... and is required only because the binary representation of Real number is very sparse and is limited in absolute and relative precision
--
Good luck
Ivar