findBoundaryConditions
Find boundary condition assignment for a geometric region
Description
returns boundary condition BCregion
= findBoundaryConditions(BCs
,RegionType
,RegionID
)BCregion
assigned to the specified
region.
Examples
Find Boundary Conditions for Particular Regions
Create a PDE model and import a simple block geometry. Plot the geometry displaying the face labels.
model = createpde(3); importGeometry(model,"Block.stl"); pdegplot(model,"FaceLabels","on","FaceAlpha",0.5)
Set zero Dirichlet conditions on faces 1 and 2 for all equations.
applyBoundaryCondition(model,"dirichlet","Face",1:2,"u",[0,0,0]);
On face 3, set the Neumann boundary condition for equation 1 and Dirichlet boundary condition for equations 2 and 3.
h = [0 0 0;0 1 0;0 0 1]; r = [0;3;3]; q = [1 0 0;0 0 0;0 0 0]; g = [10;0;0]; applyBoundaryCondition(model,"mixed","Face",3,"h",h,"r",r,"g",g,"q",q);
Set Neumann boundary conditions with opposite signs on faces 5 and 6 for all equations.
applyBoundaryCondition(model,"neumann","Face",4:5,"g",[1;1;1]); applyBoundaryCondition(model,"neumann","Face",6,"g",[-1;-1;-1]);
Check the boundary condition specification on face 1.
findBoundaryConditions(model.BoundaryConditions,"Face",1)
ans = BoundaryCondition with properties: BCType: 'dirichlet' RegionType: 'Face' RegionID: [1 2] r: [] h: [] g: [] q: [] u: [0 0 0] EquationIndex: [] Vectorized: 'off'
Check the boundary condition specification on face 3.
findBoundaryConditions(model.BoundaryConditions,"Face",3)
ans = BoundaryCondition with properties: BCType: 'mixed' RegionType: 'Face' RegionID: 3 r: [3x1 double] h: [3x3 double] g: [3x1 double] q: [3x3 double] u: [] EquationIndex: [] Vectorized: 'off'
Check the boundary condition specification on face 5.
findBoundaryConditions(model.BoundaryConditions,"Face",5)
ans = BoundaryCondition with properties: BCType: 'neumann' RegionType: 'Face' RegionID: [4 5] r: [] h: [] g: [3x1 double] q: [] u: [] EquationIndex: [] Vectorized: 'off'
Input Arguments
BCs
— Boundary conditions of a PDE model
BoundaryConditions
property of a PDE model
Boundary conditions of a PDE model, specified as the
BoundaryConditions
property of
PDEModel
.
Example: model.BoundaryConditions
RegionType
— Geometric region type
"Face"
for 3-D geometry | "Edge"
for 2-D geometry
Geometric region type, specified as "Face"
for 3-D
geometry or "Edge"
for 2-D geometry.
Example: findBoundaryConditions(model.BoundaryConditions,"Face",3)
Data Types: char
| string
RegionID
— Geometric region ID
vector of positive integers
Geometric region ID, specified as a vector of positive integers. Find the
region IDs by using pdegplot
with the
"FaceLabels"
(3-D) or "EdgeLabels"
(2-D) value set to "on"
.
Example: findBoundaryConditions(model.BoundaryConditions,"Face",3)
Data Types: double
Output Arguments
BCregion
— Boundary condition for a particular region
BoundaryCondition
object
Boundary condition for a particular region, returned as a
BoundaryCondition
object.
Version History
Introduced in R2016b
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