Switch solidInterfaceCorr(false);

solidInterface* solidInterfacePtr(NULL);

{
    const dictionary& stressControl =
      mesh.solutionDict().subDict("stressedFoam");

    solidInterfaceCorr = Switch(stressControl.lookup("solidInterface"));

    if(solidInterfaceCorr)
      {
	Info << "Creating solid interface correction" << endl;
	solidInterfacePtr = new solidInterface(mesh, rheology);
	solidInterfacePtr->modifyProperties(muf, lambdaf);
	gradDU = solidInterfacePtr->grad(DU);
	
	//- solidInterface needs muf and lambdaf to be used for divSigmaExp
	if(divDSigmaExpMethod != "surface" && divDSigmaExpMethod != "decompose")
	  {
	    FatalError << "divDSigmaExp must be decompose or surface when solidInterface is on"
		       << exit(FatalError);
	  }
      }
}