~~~~~ I have one file contains node coordinates and displacement field/temperature field data and would like to import function in Dolfinx as boundary conditions. I wonder how this works in the Dolfinx version? ~~~~~ I tried with reference to Impose Velocity Profile on Inlet Face using Array - #6 b…

I think I might have a better description of the problem.I want to import the pressure distribution (.txt) known on the surface of the solid structure as boundary conditions. I found examples that define boundary conditions: Elasto-plastic analysis of a 2D von Mises material — Numerical tours of cont…

Is the pressure distribution an explicit function of the coordinates? i.e. p=p(x,y,z) or is it only defined at certain nodes?

Pressure distribution is the form data from [x, y, z, pvalue] stored in .csv interpolation to the function defined in dolfinx.fem.functionspace.

Perhaps you may find the discussion in this topic usefull [image] Fenicsx: use an array of data for boundary conditions Hi. I have the following problem: Consider the following matrix in a 3d Poisson equation problem: (x_i, y_i, z_i, bc_i). The (x_i, y_i, z_i) are the bo…

~~~~~ Yes, I also got a lot of help from this topic before. However, the difference between my current problem and this is that the distribution I imported is not as DirichletBC, it appears in the linear term as Neumann boundary. [image] ~~~~~ At this time, the p is defined in dolfinx.fem.functions…

The pressure p cannot be a scalar value, as there is a dot product between p and v, meaning that they are of the same dimension. I guess you are assuming that the pressure p(x,y,z) is working in the normal direction?

~~~ Yes, the pressure is air pressure, it is working in the normal direction of solid surface. In this case, how do I implement it?

As stated above, you create a scalar space, as in: [image] Fenicsx: use an array of data for boundary conditions You should remove this code, as the whole point of was to replace the interpolate command and then your variational form is inner(p*n,v)*ds were n is t…

Import functions from the.txt/.csv file

dolfinx

dokken August 26, 2022, 6:18pm 2

I would suggest to make a minimal example that either produces an error, or produces a wrong result, as shown in: Impose Velocity Profile on Inlet Face using Array - #2 by dokken

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Import functions from the.txt/.csv file

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