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difference between thermo.T() and T

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Old   December 4, 2013, 08:39
Default difference between thermo.T() and T
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Can someone tell me what is the difference between defining

volScalarField myTemperature = thermo.T()
volScalarField mypressure = thermo.p()


const volScalarField& myTemperature = mesh_.lookupObject<volScalarField>("T");
const volScalarField& mypressure= mesh_.lookupObject<volScalarField>("p");
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Old   December 4, 2013, 09:45
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Typically, in a solver that solves an energy equation (e.g. rhoPimpleFoam), the temperature is defined in the thermo class (see basicThermo.H).
You can access the field like this
const volScalarField& T = thermo.T();
(see e.g. createFields.H in the reactingFoam)

So, if you didn't implement some extra volScalarField named "T" (not quite sure if it is even possible to define two fields with the same same in the object registry), you should also be able to get access to the same field by looking it up from the object registry like this
const volScalarField& T = mesh.lookupObject<volScalarField>("T");
Note that you only get a const access to "T" from "thermo.T()".
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