The influence of non-conformal grid interfaces on the results of large eddy simulation of centrifugal blood pumps.
Artif Organs
; 46(9): 1804-1816, 2022 Sep.
Article
in En
| MEDLINE
| ID: mdl-35436356
ABSTRACT
BACKGROUND:
Computational fluid dynamics has been widely used to assist the design and evaluation of blood pumps. Discretization errors associated with computational grid may influence the credibility of numerical simulations. Non-conformal grid interfaces commonly exist in rotary machines, including rotary blood pumps. Should grid size across the interface differ greatly, large errors may occur.METHODS:
This study explored the effects of non-conformal grid interface on the prediction of the flow field and hemolysis in blood pumps using large eddy simulation (LES). Two benchmarks, a nozzle model and a centrifugal blood pump were chosen as test cases.RESULTS:
This study found that non-conformal grid interfaces with considerable change of grid sizes led to discontinuities of flow variables and brought errors to metrics such as pressure head (7%) and hemolysis (up to 14%).CONCLUSIONS:
The results on the full unstructured grid are more accurate with negligible changes of flow variables across the non-conformal grid interface. A full unstructured grid should be employed for centrifugal blood pumps to minimize the influence of non-conformal grid interfaces for LES simulations.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Heart-Assist Devices
/
Hemolysis
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Artif Organs
Year:
2022
Document type:
Article
Affiliation country:
China
Publication country:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA