postRealESSI

A simple python post-processor for RealESSI HDF5 output

Intro

postRealESSI is meant to handle simple post-processing tasks for RealESSI output. postRealESSI is good for:

Plotting single (or a few) nodal displacement histories or elemental output histories.
Finding out global model parameters (number of nodes, elements, time steps, etc.)

Things postRealESSI is not really meant to do (you can do it if you want to wait a lot or have a simple model):

Showing a mesh deformed shape (use visitESSI for that)
Determining maximums or minimums of nodal or elemental data (you're better off directly doing it using the HDF5 api)

I intend to provide a simple, object oriented interface to the output format to aid in simple tasks.

Installing

Clone the repo:

git clone git@github.com:jaabell/postRealESSI.git

Install the module

cd postRealESSI
python setup.py build
sudo setup.py install

Using postRealESSI

The following example shows how to use postRealESSI to plot the time response of a node.

# Import the module
import postRealESSI

# Open a model output file
essi_model = postRealESSI.open_essi_output_file("mymodel_stage.h5.feioutput")

# Get time vector
t = essi_model.getTime()

# Get nodal displacements for node with tag 1
node1 = essi_model.getNode(1)
displacements = node1.get_generalized_displacements()

# Plot using matplotlib
import matplolib.pyplt as plt
plt.figure()
plt.plot(t,displacements[0,:], label="ux")
plt.plot(t,displacements[1,:], label="uy")
plt.plot(t,displacements[2,:], label="uz")
plt.xlabel("Time [s]")
plt.ylabel("Displacements [m]")
plt.legend()