zhyang-dev/openfoam
1
0
Fork 0
mirror of https://develop.openfoam.com/Development/openfoam.git synced 2025-11-28 03:28:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

correction to table interpolation

Browse Source
This commit is contained in:
andy
2008-05-23 11:22:06 +01:00
parent 4e787f11fe
commit 96a35a6ec3
1 changed files with 10 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
src/lagrangian/intermediate/submodels/IO/DataEntry/Table/Table.C
View File

@ -50,7 +50,6 @@ Foam::Table<Type>::Table
) << "Table is invalid (empty)" << nl
<< exit(FatalError);
}
Info<< table_;
}
@ -72,27 +71,18 @@ Type Foam::Table<Type>::value(const scalar x) const
return pTraits<Type>::zero;
}
// Find i such that x(i) < x < x(i+1)
label i = 0;
while ((table_[i].first() < x) && (i < table_.size()))
while ((table_[i+1].first() < x) && (i+1 < table_.size()))
{
i++;
}
if (i == 0)
{
return table_[0].second();
}
else if (i == table_.size() - 1)
{
return table_[i-1].second();
}
else
{
return
(x - table_[i-1].first())/(table_[i].first() - table_[i-1].first())
* (table_[i].second() - table_[i-1].second())
+ table_[i-1].second();
}
// Linear interpolation to find value
return
(x - table_[i].first())/(table_[i+1].first() - table_[i].first())
* (table_[i+1].second() - table_[i].second())
+ table_[i].second();
}
@ -127,11 +117,11 @@ Type Foam::Table<Type>::integrate(const scalar x1, const scalar x2) const
{
sum +=
(table_[i].second() + table_[i+1].second())
* (table_[i+1].first() - table_[i].first());
* (table_[i+1].first() - table_[i].first());
}
sum *= 0.5;
// Add table ends
// Add table ends (partial segments)
if (id1 > 0)
{
sum += 0.5
@ -148,4 +138,5 @@ Type Foam::Table<Type>::integrate(const scalar x1, const scalar x2) const
return sum;
}
// ************************************************************************* //