BioCFD Tutorial: part 2 Raffaele Ponzini, CINECA SCAI Dept. - PowerPoint PPT Presentation

Dec 03, 2022 •334 likes •437 views

BioCFD Tutorial: part 2 Raffaele Ponzini, CINECA SCAI Dept. Segrate, Italy PRACE Autumn School 2013 - Industry Oriented HPC Simulations, September 21-27, University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia CFD

BioCFD Tutorial: part 2 Raffaele Ponzini, CINECA – SCAI Dept. Segrate, Italy PRACE Autumn School 2013 - Industry Oriented HPC Simulations, September 21-27, University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
CFD implementation of a carotid bifurcation model in Ansys Fluent 1. Setup a CFD unsteady state model using Fluent for the carotid mesh obtained after sensitivity analysis (Part-1) 2. Implement the following BC settings:  Vin: unsteady (using udf or profile)  Flow-split imposed (60/40): MFR-ica (using udf)  No-slip at the wall 3. Perform a qualitative analysis of the obtained model 4. (Optional) Implement a non-Newtonian viscous model for blood
Proposed solution 3
Mesh size CCA SECTION 1.5 millions cells
Unsteady bc setup Solver: Relaxation cca=unsteady velocity inlet (flat profile) (udf) Variable Relaxation Factor ica=60% CCA mass-flow-inlet (unkwnon profile) (udf) ------------------------------- eca= stress-free pressure-outlet Pressure 0.69999999 Density 1 Body Forces 1 Momentum 0.30000001 Blood modeled as Newtonian incompressible Pressure-Velocity Coupling Parameter Value ------------------ Type SIMPLE Discretization Scheme Variable Scheme ----------------------------- Pressure Linear Momentum Second Order Upwind
Qualitative results: waveforms T1 T2 T3 T1 T2 T3 Mass-flow-rate in BC section Mean pressure [Kg/s] on BC faces [Pa]
Qualitative results: waveforms T1 T2 T3 Max and mean WSS [Pa]
3D velocity field: T1
3D velocity field: T2
3D velocity field: T3

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