Numerical considerations for advection‐diffusion problems in cardiovascular hemodynamics
Abstract
Numerical simulations of cardiovascular mass transport pose significant challenges due to the wide range of Péclet numbers and backflow at Neumann boundaries. In this paper we present and discuss several numerical tools to address these challenges in the context of a stabilized finite element computational framework. To overcome numerical instabilities when backflow occurs at Neumann boundaries, we propose an approach based on the prescription of the total flux. In addition, we introduce a “consistent flux” outflow boundary condition and demonstrate its superior performance over the traditional zero diffusive flux boundary condition. Lastly, we discuss discontinuity capturing (DC) stabilization techniques to address the well‐known oscillatory behavior of the solution near the concentration front in advection‐dominated flows. We present numerical examples in both idealized and patient‐specific geometries to demonstrate the efficacy of the proposed procedures. The three contributions discussed in this paper successfully address commonly found challenges when simulating mass transport processes in cardiovascular flows.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 03, 2020
- Source ID
- 10.1002/cnm.3378
Entities
People
- C. Alberto Figueroa
- Christopher J. Arthurs
- Nitesh Nama
- Onkar Sahni
- Sabrina R Lynch
- Zelu Xu
Organizations
- American Heart Association
- Army Research Office
- King's College London
- National Science Foundation
- Rensselaer Polytechnic Institute
- University of Michigan