Questions regarding VTKMesh

[alexandrebtessael]

Hello. I'm trying to work with the VTKMesh loader.
I looked at this example (https://github.com/GEOSX/GEOSX/blob/develop/inputFiles/compositionalMultiphaseWell/staircase_co2_wells_hybrid_3d.xml) but I have some questions :

1. I understood that properties defined in the .vtu can be used to define properties in GEOSX like this :

fieldsToImport="{ FluidComposition }"
fieldNamesInGEOSX="{ globalCompFraction }"

Is there a way to know what fieldNamesInGEOSX can be chosen ? A list of possibilities ?

2. The property "globalCompFraction" used in filedNamesInGEOSX is defined also within FieldSpecifications :

  <FieldSpecification
    name="initialComposition_co2"
    initialCondition="1"
    setNames="{ all }"
    objectPath="ElementRegions/Channel"
    fieldName="globalCompFraction"
    component="0"
    scale="0.005"/>

  <FieldSpecification
    name="initialComposition_water"
    initialCondition="1"
    setNames="{ all }"
    objectPath="ElementRegions/Channel"
    fieldName="globalCompFraction"
    component="1"
    scale="0.995"/>

And in the "staircase3d_tet.vtu", the "FluidComposition" also contains the same values.
Is it the scale in FieldSpecification or the values in the .vtu that are used to define the globalCompFraction of the cells during the simulation ?

3. As in question 2, if the property defined in the .vtu is now defined in the Constitutive elements, is the value inside the .vtu the one that will be used during the simulation or is it the one inside the Constitutive element ?

4. If I have multiple .vtu files of the same mesh with the evolution of a property through multiple timesteps like pressure, is it possible to use these multiple .vtu files within the same xml ?