help for ANSYS Fluent : cylindrical flow
I start a project to study digital and it's been 4 months since I started with ANSYS13 FLUENT.
I start by simulating the flow of blood through a vein with the presence of a probe (blood flow between two parallel cylinders) to validate my model.
The study is already done.
I can not find the correct profile (I found an acceleration along the cylinder) figure (A), the rate does not stabilize. The flow is along the Z axis
Normally I have to find a profile such that the figure (B)
The conditions I have are:
The vein is modeled by a straight cylinder of diameter D = 25.8mm and length L = 300mm. The probe is modeled by a right cylinder of diameter d = 3.1mm and the same length.
The flow area is S = pi (D ²-d ²) / 4 = 515.245mm ²
The flow is assumed laminar
The walls are assumed fixed and rigid over time.
The blood is assumed Newtonian studied with a density and viscosity 1050Kg/m3 0.0045Kg / (ms)
The temperature is set at 310 ° K (body temperature 37 ° C)
The boundary conditions are imposed
o Input: Q = 3600ml/min therefore a mass flow of 0.0633Kg / s
o Output: P = 399.96 Pa
I use the following configurations on fluent
Model: viscous laminar
Material: Fluid: Blood
Boundary condition: Massflowin =0.0633Kg/s
In case of constant density try to use velocity inlet instead mass flow inlet, as recommended 7.2.1 Using Flow Boundary Conditions
Since blood is Non-Newtonian liquid, you can use Herschel-Buckley, or Cross model for viscosity in Materials dialog.
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