CFD Online Discussion Forums - why my momentum and mass not convergence

dear all,

my case is simulate the the fan in an tools, i just want to know the massflow, but i can not get the right result ,since the RMS not convergence even more than 1000 iterations.

the parameters is copied below,

LIBRARY:

MATERIAL: Air at 25 C

Material Description = Air at 25 C and 1 atm (dry)

Material Group = Air Data, Constant Property Gases

Option = Pure Substance

Thermodynamic State = Gas

PROPERTIES:

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END

FLOW: Flow Analysis 1

SOLUTION UNITS:

Angle Units = [rad]

Length Units = [m]

Mass Units = [g]

Solid Angle Units = [sr]

Temperature Units = [K]

Time Units = [s]

END

ANALYSIS TYPE:

Option = Steady State

EXTERNAL SOLVER COUPLING:

Option = None

END

DOMAIN: housing

Coord Frame = Coord 0

Domain Type = Fluid

Location = DOMAIN_OF_STATOR

BOUNDARY: Default Fluid Fluid Interface Side 1

Boundary Type = INTERFACE

Location = Primitive 2D AS,Primitive 2D AT,Primitive 2D AU,Primitive \

2D AV,Primitive 2D R,Primitive 2D S,Primitive 2D T,Primitive 2D U

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = Conservative Interface Flux

END

TURBULENCE:

Option = Conservative Interface Flux

END

BOUNDARY: baffle

Boundary Type = WALL

Location = BAFFLE

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = No Slip Wall

END

WALL ROUGHNESS:

Option = Smooth Wall

END

BOUNDARY: brakets

Boundary Type = WALL

Location = BRACKETS

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = No Slip Wall

END

WALL ROUGHNESS:

Option = Smooth Wall

END

BOUNDARY: housing Default

Boundary Type = WALL

Location = HEAT_SINK,MOSFET1,MOSFET2,PCB

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = No Slip Wall

END

WALL ROUGHNESS:

Option = Smooth Wall

END

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BOUNDARY: inlet

Boundary Type = OPENING

Location = INLET,INLET2

BOUNDARY CONDITIONS:

FLOW DIRECTION:

Option = Normal to Boundary Condition

END

FLOW REGIME:

Option = Subsonic

END

MASS AND MOMENTUM:

Option = Opening Pressure and Direction

Relative Pressure = 0 [Pa]

END

TURBULENCE:

Option = Medium Intensity and Eddy Viscosity Ratio

END

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BOUNDARY: outlet

Boundary Type = OUTLET

Location = OPENING

BOUNDARY CONDITIONS:

FLOW REGIME:

Option = Subsonic

END

MASS AND MOMENTUM:

Option = Average Static Pressure

Pressure Profile Blend = 0.05

Relative Pressure = 0 [Pa]

END

。。。。。。。。。。。。。

DOMAIN: rotor domain

Coord Frame = Coord 0

Domain Type = Fluid

Location = DOMAIN_OF_ROTOR

BOUNDARY: Default Fluid Fluid Interface Side 2

Boundary Type = INTERFACE

Location = Primitive 2D AO,Primitive 2D AP,Primitive 2D AQ,Primitive \

2D AR,Primitive 2D AW,Primitive 2D AX,Primitive 2D AY,Primitive 2D AZ

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = Conservative Interface Flux

END

TURBULENCE:

Option = Conservative Interface Flux

END

CONVERGENCE CONTROL:

Maximum Number of Iterations = 500

Minimum Number of Iterations = 1

Physical Timescale = 0.01 [s]

Timescale Control = Physical Timescale

END

CONVERGENCE CRITERIA:

Residual Target = 0.00001

Residual Type = RMS

END

DYNAMIC MODEL CONTROL:

Global Dynamic Model Control = On

END

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Memory Allocation Factor = 1.0

END

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