Issue assigning different initial concentrations for multiple tracers in ATS

[Xueyuan Kang]

Hello all,

I am trying to set different initial concentrations for different zones — for example, concentration of Tracer0 = 1 in region geology0, and Tracer1 = 1 in region geology1.

 

This setup works fine when I only use a single tracer (Tracer0). However, when I include two tracers (Tracer0 and Tracer1), ATS does not assign the initial concentrations correctly. Instead, it seems to apply all initial conditions to Tracer0 only.

 

The ATS version I’m using is 1.5.2.

 

Below are the relevant parts of my XML setup:

(1) In the cycle driver:

        <ParameterList name="field initialization">

              <Parameter name="total_component_concentration" type="Array(string)" value="{initial condition}" />

     </ParameterList>

 

(2) In state -> initial conditions:

  <ParameterList name="state" type="ParameterList">

<ParameterList name="evaluators" type="ParameterList">

*******

 

<ParameterList name="initial conditions" type="ParameterList">

 

<ParameterList name="total_component_concentration">

  <Parameter name="field evaluator type" type="string" value="independent variable" />

  <Parameter name="component" type="string" value="cell" />

 

  <ParameterList name="function">

 

    <ParameterList name="Tracer0" type="ParameterList">

      <Parameter name="regions" type="Array(string)" value="{geology0}" />

         <Parameter name="component" type="string" value="cell" />

      <Parameter name="operation" type="string" value="sum" />

      <ParameterList name="function" type="ParameterList">

        <ParameterList name="function-constant" type="ParameterList">

          <Parameter name="value" type="double" value="1.0" />

        </ParameterList>

      </ParameterList>

    </ParameterList>

      

 

    <ParameterList name="Tracer1" type="ParameterList">

      <Parameter name="regions" type="Array(string)" value="{geology1}" />

         <Parameter name="component" type="string" value="cell" />

      <Parameter name="operation" type="string" value="sum" />

      <ParameterList name="function" type="ParameterList">

        <ParameterList name="function-constant" type="ParameterList">

          <Parameter name="value" type="double" value="1.0" />

        </ParameterList>

      </ParameterList>

    </ParameterList>

 

  </ParameterList>

</ParameterList>

 

Has anyone encountered a similar issue, or could suggest how to properly assign initial conditions to multiple tracers in ATS?

Any suggestions or comments would be greatly appreciated!

Best,

Xueyuan

 

[Bo Gao]

Hi Xueyuan,

The setup you have here is weird to me. Can you please attach your input file? Thanks.

Best,

Bo Gao

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[Phong Le]

Hi Xueyuan,

You can follow the transport solution example from the recent ATS shortcourse on this. You need to create a function with 2 dofs, so ATS can read the input correctly. Otherwise, it only reads the first tracer and move on with tracer2 = 0.

https://github.com/amanzi/ats-short-course/blob/ats-short-course-20250908/03_transport/.transport_solution.xml

Phong

[Xueyuan Kang]

Hello Phong and Bo, 

Thanks for your reply! Yes, I followed the example Phong suggested and create a function with 2 dofs. It works! 

Thank you so much!

Best,

Xueyuan