Home > List of Keywords > *CDAX,FILE=FILEMANE
*CDAX,FILE=Filename
Data format:
A single line with 4 parameters, as follows:
IGR IEND INC NU
Status:
Optional
Restriction:
Elements must be previously defined
Purpose:
To define the roughness of an element, used for axial drag calculations
Details :
| Parameter | Description |
|---|---|
| IGR | Group number of the line |
| IEND | IEND = 0: Reference is beginning of group, IEND = 1: Reference is end of group, |
| INC | incidence (in degres) above which the law is not valid. |
| NU | Kinematic viscosity for the group (m2/s) |
Note
INC is positive.
If the file is not provided a default formula is used.
The file provides Cd (Reynolds number, rugosity). The format is as follows:
IRE IKR
Re_1
...
Re_IRE
Kr_1
...
Kr_IKR
Cd(Re_1, Kr_1)
...
Cd(Re_IRE, Kr_1)
...
Cd(Re_1, Kr_IKR)
...
Cd(Re_IRE, Kr_IKR)
with
- IRE : number of values of Reynolds number
- IKR : number of values of values for rugosity
- Re_1 : Re_IRE : Re numbers in increasing order
- Kr_1 : Kr_IKR : rugosity (m) in increasing order
- Cd(Re_i,Kr_j) : value of axial Cd at Re_i, Kr_j
Values of axial Cd are inteepolated. If the point is outside the bound of the arrays, the closest value is used, not extrapolation is performed.
The files has 2+IRE+IKR+(IRE'IKR) lines.
