[Tobi]

Hi all,

I think it is a very stupid question but how can I build a 4th order array in FOAM?

T[w][x][y][z]

like:

vector< vector< vector< vector<double> > > > T

Thanks in advance,

[marupio]

What do you want to do with the data? There's a number of OpenFOAM-ish ways to do that, each with different advantages.

In OpenFOAM, "List" is (very close to) a std::vector.
List<List<List<scalarList> > > T();

or with math operators
List<List<scalarFieldField> > T();

You could also use PtrList, or UPtrList if unallocated.

[Tobi]

Hi,

thanks for your replay. I store thermodynamic values in that array. Maybe you know the flamelet model? There you have all thermodynamic values based on three variables - with defect you have four variables. Therefore I have to store it in an very big array.

Like

phi of enthalpy, dissipation rate, mixture fraction and varianz mixture fraction


Hence this I need a 4d array:

T[h][chi][Z][Zvar]

Hope its clearer.
I only have to read a file, store the date in the array and then extract the data again (no mathematical operations are needed within this array).
So do you think, list is a good choice ?

Thanks in adavance,

[Prabs27]

Hi @Tobi , this thread seems to be a decade old but i hope you still remember what you were talking about and hope you figured out. You seem to have some experience in working with multi-dimensional arrays in openFoam. I have to convert a 3 dimensional array into 4 dimensional one in a humongous code. For eg:

lift[i][j][k]=0.5*Cl[i][j][k]*Vmag[i][j][k]*Vmag[i][j][k]*chord*db[i][k];

can you suggest any sources where i can learn to add an index say l to make it like [i][j][k][l] throughout my code consistently.




Regards
Prabs

[Tobi]

You can use the <map> container and use keys. http://www.cplusplus.com/reference/map/map/