Hi syavash,

You can use FieldConvert inside your session file. Here is an example that calculates the gradient of all fields and writes into an existing folder called timeSteps:

    <FILTERS>
        <FILTER TYPE="FieldConvert">
            <PARAM NAME="OutputFile">timeSteps/out.chk</PARAM>
            <PARAM NAME="OutputFrequency">1.0e+04</PARAM>
            <PARAM NAME="Modules"> gradient </PARAM>
        </FILTER>
    </FILTERS>

With the newest version, I think you can select the fields that you want to take the gradient of. But I am using 5.2.0, so I cannot provide a working code script for that.

Cheers,
Ilteber

--
İlteber R. Özdemir



On Fri, 7 Apr 2023 at 12:02, Ehsan Asgari <eh.asgari@gmail.com> wrote:

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Dear All,

How can I compute the velocity gradient during runtime? I see a module for FieldConvert but I need to have the gradients during the simulation.
Velocity gradients are to be used to calculate the TKE dissipation term. The latter may be used to calculate the Kolmogorov length scale.

Is there any filter for this? Or can anyone suggest a workaround?

Kind regards
syavash
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