Hello. I set the right border of the grid in the variable L_f, which depends on the time. How to change the grid in a loop so that the border changes according to the value of L_f? from dolfin import * import matplotlib.pyplot as plt import numpy as np import scipy.special import math import os pl…

Is there an example with IntervalMesh? And then it doesn’t work for me if UnitSquareMesh is replaced with IntervalMesh

Consider the following: from dolfin import * from typing import List mesh = UnitIntervalMesh(10) V = VectorFunctionSpace(mesh, "CG", 1) x = SpatialCoordinate(mesh) disp = project(as_vector((x[0],)), V) disp_bc = DirichletBC(V, disp, "near(x[0], 1)") fixed_bc = DirichletBC(V, Constant((0,)), "near…

By changing FunctionSpace to VectorFunctionSpace, an error appears: *** Error: Unable to create Dirichlet boundary condition. *** Reason: Expecting a vector-valued boundary value but given function is scalar.

Please provide a minimal code, as I do not understand what you have changed in your code to get this error

In my code, I replaced FunctionSpace with VectorFunctionSpace and an error appeared

Which FunctionSpace? This one: [image] dokken: def deform_mesh(V:FunctionSpace, bcs: List[DirichletBC]): ? This is why Im asking you to post the code that gives you the error message, as this is a type-hint, and should have no effect on your code, thus there is something else that is not wo…

How to change grid borders over time

General

dokken May 3, 2023, 8:43am 2

See: How to use ALE for moving boundary problems? - #2 by dokken

Topic		Replies	Views
Boundary condition vary General	1	368	January 3, 2023
How to use ALE for moving boundary problems? mesh	10	3740	February 26, 2025
Updating temporal boundary conditions variational formulation	2	449	March 12, 2021
Time dependent Dirichlet boundary conditions FEniCSx Errors	6	721	October 30, 2023
Update time-dependent Dirichlet BC values for FSI Problem variational formulation	2	935	November 25, 2020

How to change grid borders over time

Related topics