Main Content

findStructuralIC

Find initial displacement and velocity assigned to geometric region

collapse all in page

Domain-specific structural workflow is not recommended. New features might not be compatible with this workflow. For help migrating your existing code to the unified finite element workflow, see Migration from Domain-Specific to Unified Workflow.

Syntax

sica = findStructuralIC(initialConditions,RegionType,RegionID)

Description

sica = findStructuralIC(initialConditions,RegionType,RegionID) returns the initial displacement and velocity assigned to the specified region.

example

Examples

collapse all

Open Live Script

Find the initial displacement and velocity assigned to the cells of a 3-D geometry.

Create a transient dynamic model for a 3-D problem.

structuralmodel = createpde("structural","transient-solid");

Create the geometry consisting of the three nested cylinders and include it in the model. Plot the geometry.

gm = multicylinder([5 10 15],2);
structuralmodel = createpde("structural","transient-solid");
structuralmodel.Geometry = gm;
pdegplot(structuralmodel,"CellLabels","on","FaceAlpha",0.5)

Figure contains an axes object. The axes object contains 6 objects of type quiver, text, patch, line.

Set the initial conditions for each cell. When you specify only the initial velocity or initial displacement, structuralIC assumes that the omitted parameter is zero.

structuralIC(structuralmodel,"Displacement",[0;0;0],...
                             "Velocity",[0;0;0], ...
                             "Cell",1);
structuralIC(structuralmodel,"Displacement",[0;0.1;0], ...
                             "Cell",2);
structuralIC(structuralmodel,"Velocity",[0;0.2;0], ...
                             "Cell",3);

Check the initial condition specification for cell 1.

SICACell1 = findStructuralIC(structuralmodel.InitialConditions,"Cell",1)
SICACell1 = 
  GeometricStructuralICs with properties:

             RegionType: 'Cell'
               RegionID: 1
    InitialDisplacement: [3x1 double]
        InitialVelocity: [3x1 double]


SICACell1.InitialDisplacement
ans = 3×1

     0
     0
     0


SICACell1.InitialVelocity
ans = 3×1

     0
     0
     0
Open Live Script

Use a static solution as an initial condition for a dynamic structural model. Check and plot the initial displacement.

Create a static model.

staticmodel = createpde("structural","static-solid");

Create the geometry and include it in the model. Plot the geometry.

gm = multicuboid(0.06,0.005,0.01);
staticmodel.Geometry = gm;
pdegplot(staticmodel,"FaceLabels","on","FaceAlpha",0.5)
view(50,20)

Figure contains an axes object. The axes object contains 6 objects of type quiver, text, patch, line.

Specify Young's modulus, Poisson's ratio, and the mass density.

structuralProperties(staticmodel,"YoungsModulus",210E9, ...
                                 "PoissonsRatio",0.3,...
                                 "MassDensity",7800);

Apply the boundary condition and static load.

structuralBC(staticmodel,"Face",5,"Constraint","fixed");
structuralBoundaryLoad(staticmodel,"Face",3, ...
                                   "SurfaceTraction",[0;1E6;0]);
generateMesh(staticmodel,"Hmax",0.02);
Rstatic = solve(staticmodel);

Create a dynamic model and assign geometry.

dynamicmodel = createpde("structural","transient-solid");
gm = multicuboid(0.06,0.005,0.01);
dynamicmodel.Geometry = gm;

Apply the boundary condition.

structuralBC(dynamicmodel,"Face",5,"Constraint","fixed");

Specify the initial condition using the static solution.

generateMesh(dynamicmodel,"Hmax",0.02);
structuralIC(dynamicmodel,Rstatic)
ans = 
  NodalStructuralICs with properties:

    InitialDisplacement: [189x3 double]
        InitialVelocity: [189x3 double]

Check the initial condition specification for dynamicmodel.

sica = findStructuralIC(dynamicmodel.InitialConditions,"Cell",1)
sica = 
  NodalStructuralICs with properties:

    InitialDisplacement: [189x3 double]
        InitialVelocity: [189x3 double]

Plot the z-component of the initial displacement.

pdeplot3D(dynamicmodel,"ColorMapData",sica.InitialDisplacement(:,3))
title("Initial Displacement in the Z-direction")

Figure contains an axes object. The hidden axes object with title Initial Displacement in the Z-direction contains 5 objects of type patch, quiver, text.

Input Arguments

collapse all

Initial conditions of a transient structural model, specified as the InitialConditions property of a StructuralModel object.

Example: structuralmodel.InitialConditions

Geometric region type, specified as "Face", "Edge", or "Vertex" for a 2-D model or 3-D model, or "Cell" for a 3-D model.

Data Types: char

Geometric region ID, specified as a vector of positive integers. Find the region IDs by using pdegplot.

Data Types: double

Output Arguments

collapse all

Structural initial condition for a particular region, returned as a GeometricStructuralICs or NodalStructuralICs object. For details, see GeometricStructuralICs Properties and NodalStructuralICs Properties.

Version History

Introduced in R2018a

See Also

| | |