CFD Online Discussion Forums - Problem with velocity profile varying in time

Hi everybody, im a postgraduate student currently working with openfoam. I have a problem and i can't figure how to solve it, i have this velocity profile,

Code:

    inlet_profile

    {

        type            codedFixedValue;

        value           uniform (0 0 0);

        name   parabolicProfile;

        

            code

            #{                

                const fvPatch& boundaryPatch = patch(); 

                const vectorField& Cf = boundaryPatch.Cf(); 

                vectorField& field = *this; 



                scalar t = this->db().time().value();

                forAll(Cf, faceI)

                {

                   field[faceI] = vector (sin(t*3.141592/0.2)*0.8*(0.5-0.5*tanh(10.*((200.0*(sqrt(pow(Cf[faceI].y(),2)+pow(Cf[faceI].z(),2))))-1.0))) ,0,0);

                }

            #};

        

    }

as you can see, my profile varies in time (sine function) but I don't know how to "change" this dependence after I arrive certain value, what I want to do is when I arrive to time=0.2[sec] change the profile to another one ( for example for t>0.2[sec] change to U=(0,0,0) and continue the simulation), I think I need to use an IF statement, but I don't know how to do it.

Thank you