How to plot temperature time history on a set of nodes in Mechanical using DPF?

Rohith Patchigolla
Rohith Patchigolla Member, Moderator, Employee Posts: 218
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in Structures

I have some nodes on which I want to plot temperature variation over time in a thermal analysis. I have not created a named selection for these nodes. How can I use Python Result object to plot time vs Temperature plot for these nodes?

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  • Rohith Patchigolla
    Rohith Patchigolla Member, Moderator, Employee Posts: 218
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    edited March 2024

    Tested in 23R2 and 24R1.

    Step 1: RMB on Solution (of a thermal analysis) --> Insert --> Python Results
    Step 2: You can use the below script in a Python Result object in Mechanical to plot temperature time history on a set of nodes provided as an input via a list "nodeIds".

    def post_started(sender, analysis):# Do not edit this line
    define_dpf_workflow(analysis)

# Uncomment this function to enable retrieving results from the table/chart
def table_retrieve_result(value):# Do not edit this line
    import mech_dpf
    import Ans.DataProcessing as dpf
    wf = dpf.Workflow(this.WorkflowId)
    wf.Connect('contour_selector', value)
    this.Evaluate()

def define_dpf_workflow(analysis):
    import mech_dpf
    import Ans.DataProcessing as dpf
    mech_dpf.setExtAPI(ExtAPI)
    dataSource = dpf.DataSources(analysis.ResultFileName)
    model = dpf.Model(dataSource)


    #Input node numbers
    nodeIds = [10265, 10266]
    scoping = dpf.Scoping()
    scoping.Location = 'Nodal'
    scoping.Ids = nodeIds

    temp = dpf.operators.result.temperature()

    time_freq_support = dpf.operators.metadata.time_freq_provider()
    time_freq_support.inputs.data_sources.Connect(dataSource)
    n_sets = time_freq_support.outputs.time_freq_support.GetData().NumberSets

    timeScop = dpf.Scoping()

    # Compute time history
    time_steps = range(1, n_sets + 1)
    timeScop.Ids = time_steps
    temp.inputs.time_scoping.Connect(timeScop)
    temp.inputs.data_sources.Connect(dataSource)
    temp.inputs.mesh_scoping.Connect(scoping)
    dpf_workflow = dpf.Workflow()
    dpf_workflow.Add(temp)
    dpf_workflow.SetInputName(temp, 0, 'time')
    dpf_workflow.Connect('time', timeScop)
    dpf_workflow.SetOutputContour(temp)
    dpf_workflow.Record('wf_id', False)
    this.WorkflowId = dpf_workflow.GetRecordedId()

    Step 3: RMB on Solution --> Evaluate all results

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