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w03-g04-dump-output

Write output file with data to be plotted

Objective

Part 1

Write a code to write output files which contain the nodes coordinates, element connectivity, and displacements. Name your code file dump_output.cpp and place it into tehpc/basics/.

Your code should have the following variables:

  • dim for the spatial dimension
  • nb_nodes for the number of nodes
  • nb_elements for the number of elements
  • nb_nodes_per_element for number of nodes per element
  • coordinates a 2D array with the node coordinates, accessible by coordinages[node-index][direction]
  • connectivity a 2D array with the node indexes creating the elements, and accessible by connectivity[element-index][0 or 1] and returns the node index
  • displacements, a 2D array with nodal displacement, where access to values is given by [node-index][direction].

Use the following values:

  • node 0: x=1, y=0

  • node 1: x=0, y=0

  • node 2: x=1, y=1

  • element 0 connects nodes: 0 and 2

  • element 1 connects nodes: 1 and 2

  • displacement of node 0: ux=0, uy=0

  • displacement of node 1: ux=0, uy=0

  • displacement of node 2: ux=0.382843, uy=-0.1

Name the output files:

  • results.coord.csv
  • results.conn.csv
  • results.disp.csv

and use comma-seperate format, where you each line corresponds to a node or element, respectively, and each column to a direction, or node-of-element.

Part 2

Write code to print the displacements matrix to the terminal. Make sure that 1) you can define the precision of the values to be printed, and 2) that values show as a matrix and are nicely aligned by the decimal point.

Notes

Compile and run your code by:

  1. going into the tehpc/build/basics/ folder
  2. compile with the following command: g++ -Werror -Wpedantic -g -o dump_output ../../basics/dump_output.cpp
  3. run code with ./dump_output
  4. check results by ../../basics/dump_output.py results

Guidance

  1. define a string with the dump location "."
  2. define a string for the name of the data, ie. "results"
  3. define and initialize all variables and arrays
  4. open file with name as described above
  5. check if it is open
  6. define that you want to write in scientific notation into the file
  7. loop over the coordinates array and write values to file (use "," to seprate values, and "\n" for new lines)
  8. close the file
  9. Repeat points 4.-8. for connectivity and displacements
  10. do a similar thing but write to the terminal screen the values of the displacement. Use also scientific notations.