An Interface-Fitted Fictitious Domain Finite Element Method for the Simulation of Neutrally Buoyant Particles in Plane Shear Flow
Abstract
:1. Introduction
2. Model Problems
3. An Interface-Fitted Fictitious Domain Finite Element Method
3.1. Weak Formulation Based on the Fictitious Domain Method
3.2. Interface-Fitted Mesh and ALE Mapping
Algorithm 1: Moving mesh by a rotational ALE mapping. |
1. Draw an artificial circular buffer zone, , in the fluid domain to enclose the immersed particle and share the same axis of rotation. Denote , and . 2. Triangulate with that fits and , i.e., for any edge , let and . Fix the mesh as for . 3. Rotate together with the particle at the same angular velocity and about the same axis of rotation to obtain a rotating mesh . 4. Locally shift the nodes on the artificial interface associated with in order to find and match with the fixed coordinates of the closest nodes on associated with . Thus, the rotating and conforming mesh , further, the total mesh are obtained. |
Algorithm 2: Moving mesh by local smoothing among interface-cut elements. |
1. Triangulate into a rectangular mesh with a given mesh size (resp. ) in x-axis (resp. y-axis) direction that is independent of time t. 2. Inspect all vertices of in the column-wise lexicographic order, and divide them into fluid- (black), interface- (red), and rigid particle’s (blue) vertex sets associated with the current position of fluid-particle interface , where the red interface vertices are those vertices closest to , as shown in the top-left part of Figure 3. 3. Move all red interface vertices onto the fluid-particle interface to set them as the closest intersection points between and , respectively. 4. Cut each quadrilateral of with the slash diagonal to obtain a triangular mesh of , , where some edges of may intersect with the interface, as shown in the top-right part of Figure 3. 5. Locally adjust interface-cut elements of using vertex smoothing and edge swapping techniques [24] to enhance the mesh quality, simultaneously, ensure the edges of each element are all aligned with the fluid-particle interface . Thus, an interface-fitted mesh is generated, as depicted in the bottom-left part of Figure 3. |
3.3. A Interface-Fitted Fictitious Domain Finite Element Method
4. Numerical Experiments
4.1. Circular Particle
4.2. Elliptical Particle
5. Conclusions and Future Work
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Symbols | Description | Units |
---|---|---|
L | Length of domain | m |
D | Width of domain | m |
Fluid velocity | m · s-1 | |
p | Fluid pressure | Pa |
Gravitational acceleration | m · s-2 | |
Density of fluid | kg · m-2 | |
Viscosity of fluid | Pa · s-1 | |
Density of particle | kg · m-2 | |
M | Mass of particle | kg |
Velocity of center of mass | m · s-1 | |
Position of center of mass | m | |
Moment of inertia of particle | kg · m2 | |
Angular velocity of particle | rad · s-1 | |
Inclination angle of particle | rad | |
Hydrodynamic force of particle | N | |
T | Hydrodynamic torque of particle | N · m |
Radius r | |||
---|---|---|---|
Algorithm 1 | |||
Algorithm 2 |
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Liang, Y.; Wang, C.; Sun, P. An Interface-Fitted Fictitious Domain Finite Element Method for the Simulation of Neutrally Buoyant Particles in Plane Shear Flow. Fluids 2023, 8, 229. https://doi.org/10.3390/fluids8080229
Liang Y, Wang C, Sun P. An Interface-Fitted Fictitious Domain Finite Element Method for the Simulation of Neutrally Buoyant Particles in Plane Shear Flow. Fluids. 2023; 8(8):229. https://doi.org/10.3390/fluids8080229
Chicago/Turabian StyleLiang, Yi, Cheng Wang, and Pengtao Sun. 2023. "An Interface-Fitted Fictitious Domain Finite Element Method for the Simulation of Neutrally Buoyant Particles in Plane Shear Flow" Fluids 8, no. 8: 229. https://doi.org/10.3390/fluids8080229