# help for ANSYS Fluent : cylindrical flow

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 April 16, 2012, 10:24 help for ANSYS Fluent : cylindrical flow #1 New Member   slim Join Date: Apr 2012 Posts: 18 Rep Power: 7 Hello everyone, 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 Pout =399.96Pa

April 16, 2012, 16:12
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vlg
Join Date: Jul 2011
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Quote:
 Originally Posted by slimmsk [LEFT][LEFT] [LEFT][LEFT] Pout =399.96Pa
oK, you set pressure outlet B.C, didn't you?

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.

 Tags ansys 13, blood flow, cylindrical flow, fluent

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