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Forum: Main CFD Forum

February 11, 2011, 09:53

Replies: 5

Numerical precision

Views: 1,999

Posted By DoHander

If you are sure both codes have no bugs, than you...

If you are sure both codes have no bugs, than you can try to play with precision in C++.
Try first to convert floats to doubles, and after that doubles to long double.

What I suspect is that your...

Forum: Main CFD Forum

March 12, 2010, 21:28

Replies: 5

Numerical precision

Views: 1,999

Posted By DoHander

A simple example on a 64 bits computer ...

A simple example on a 64 bits computer

acos(-1) , exact value = pi

C/C++ using long double:
3.1415926535897932385128089594061862

Fortran 95 using selected_real_kind(32,99)...

Forum: Main CFD Forum

March 12, 2010, 18:54

Replies: 5

Numerical precision

Views: 1,999

Posted By DoHander

Numerical precision

Hello,

I've recently implemented 3 small CFD solvers one in C++, one in Fortran 95/2003 and one in Matlab for comparation purposes, both compiled codes were parallelized using OpenMP.

I've...

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