Index
Drag
Ver: 1
 

DESCRIPTION

Sets the parameters for the air drag model that can be used in axisymmetric fiber spinning simulations. In that model, the air drag is expressed as follows :
 

Drag = 0.5 * Cd * Rho * V**2

 
with Cd = P1Drag / ( Re**P2Drag)
Rho = (MGas*Press/RUniv) / (T+Tref+T0)
Re = Radius * V / NuGas
where Re is the Reynolds number
Rho is the density of the gas (air)
MGas is the mole mass of the gas (air)
Press is the pressure
RUniv is the molar gas constant
Tref is a temperature reference
T0 is a temperature offset
Radius is the local radius of the fiber
NuGas is the kinematik viscosity of the gas (air)
P1Drag and P2Drag are two independent parameters   OPTIONS
 
-1
 Upper level menu
The current parameters are accepted
0
 Enable drag
Switches the model on
0'
 Disable drag
Switches the model off
1
 Modify P1Drag = 1.0000000E+00
2
 Modify P2Drag = 0.0000000E+00
3
 Modify MGas = 1.0000000E+00
4
 Modify Press = 1.0000000E+00
5
 Modify RUniv = 1.0000000E+00
6
 Modify Tref = 0.0000000E+00
7 Modify T0 = 0.0000000E+00
8
 Modify NuGas = 1.0000000E+00

Remark : NuGas cannot be set when the sub-task is non-isothermal and the user has access to the 'Flux fiber spinning' thermal boundary condition. In such a case, NuGas is calculated as a function of temperature.