[Sabyasachi]

I was trying to write an equation that is a second derivative of time.
For example, the wave equation,

fvm::d2dt2(T)
	     ==
		fvm::laplacian(DT, T)

using the openfoam ESI version 2412.

But it shows error that:

 error: ‘d2dt2’ is not a member of ‘Foam::fvm’; did you mean ‘ddt’?
   68 |                 fvm::d2dt2(T)
      |                      ^~~~~
      |                      ddt

How can I solve this for openfoam-v2412?

[amirhosseintaran]

Originally Posted by Sabyasachi

I was trying to write an equation that is a second derivative of time.
For example, the wave equation,

fvm::d2dt2(T)
	     ==
		fvm::laplacian(DT, T)

using the openfoam ESI version 2412.

But it shows error that:

 error: ‘d2dt2’ is not a member of ‘Foam::fvm’; did you mean ‘ddt’?
   68 |                 fvm::d2dt2(T)
      |                      ^~~~~
      |                      ddt

How can I solve this for openfoam-v2412?

Hi Sabyasachi


Have you included relevant headers within your application?

I suggest you take a look at:

solvers/acoustic/acousticFoam/paEqn.H

which itself is part of

acousticFoam.C

,

You'll see that these headers are being included:

#include "fvCFD.H"
#include "fvOptions.H"

Bests,
Amir.

[Sabyasachi]

Thank you.