- **OpenFOAM Running, Solving & CFD**
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- - **Lagrangian Derivative**
(*http://www.cfd-online.com/Forums/openfoam-solving/60066-lagrangian-derivative.html*)

Is it possible to take the LagIs it possible to take the Lagrangian derivative of a volVectorField (U) and (in a seperate equation) also a volScalar Field (T)? At the moment when I try to use these I get the following errors:
fvc::DDt(U) + .... error: no matching function for call to 'DDt(Foam::volVectorField&)' and for T: fvc::DDt(T)+.... error: no matching function for call to 'DDt(Foam::volScalarField&)' If it is not possible can anyone suggest a solution? Thanks in advance, Shaun |

Sorry for stating the obvious,Sorry for stating the obvious, but the substantial derivative requires a velocity field, right? Therefore in order to evaluate it, fvc:: (or fvm:: for that matter), needs access to the fluxes - that's why you need to arguments. Have a look at fvcDDt.H for the list of available function signatures.
Hrv |

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