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- - **Problem in representing term of PDE**
(*https://www.cfd-online.com/Forums/openfoam-solving/57987-problem-representing-term-pde.html*)

Hi everybody,
I am using OpHi everybody,
I am using OpenFoam to solve a flow problem where the oldroyd derivative (Time convected derivative) has to be taken into account. In it there are two terms, tensor*grad(u) and Grad(Transpose U)*Tensor, where I am having problems. Tensor is a tensorial field and U is the velocity. For the first term was reprented in the formm tensor & fvc::grad(U). It worked. However, for the second term if I represent it in the form fvc::grad(U.T()) & tensor, it does not work. What am I doing wrong? Should I define the transpose before aplying the fvc? António Martins |

Hi !
Are you sure your termHi !
Are you sure your term is not transpose(grad(U)). If it is the case, then use the following code: volTensorField gradU = fvc::grad(U); //First term: (tensor & gradU) //Second term: (gradU.T() & tensor) Mathieu |

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