- **FLOW-3D**
(*https://www.cfd-online.com/Forums/flow-3d/*)

- - **Cusomisation inertia**
(*https://www.cfd-online.com/Forums/flow-3d/73713-cusomisation-inertia.html*)

Cusomisation inertiaHi!
I need to develop a customisation function in Flow 3D with fortran? I need to compute fluid inertia for each time step and to have the evolution as function of time ? who can send me an exemple of customisation (.f file) or a title of a book where i can find exemple ? :confused: Thanks a lot |

Hi Luc
I also find difficulty to get any tutorial/example/reference that show user on how to conduct the customization with Flow-3D. Hope others users/expert that have the information can share with us. thanks in advance. |

any answer ?Hi,
For the moment no answer I continue to work on customisation but for the moment it isn't working.....! :mad: Who can help us ? Luc |

Quote:
By inertia do you mean fluid mass or momentum? Here is a sample code to do x-direction momentum. You can put this code in the user-customizable routine QSADD: c initialize before summing up if (nbl.eq.1) fluid_mom_x=zero do nn=ijklim2(nbl,1),ijklim2(nbl,2) ijk=ijk2m1(nn) if(vf(ijk).lt.em6 .or. icstat(ijk).le.0) cycle ! skip blocked and boundary cells i=i_str(ijk) j=j_str(ijk) k=k_str(ijk) cell_vol=vf(ijk)*delx(i)*dely(j)*delz(k)/rri(i) ! open cell volume include '../mijk.f' ! compute neighbor indices u_centered=(afr(imjk)*u(imjk)+afr(ijk)*u(ijk))/(afr(imjk)+afr(ijk)+em6) ! average velocity to cell center cell_mom_x=rho(ijk)*u_centered*cell_vol ! cell momentum if(nmat.eq.1) cell_mom_x=f(ijk)*cell_mom_x ! times fluid fraction for one-fluid problems fluid_mom_x=fluid_mom_x+cell_mom_x! summation enddo c print the result if(nbl.eq.nblcks) print*,'time=',t,'fluid x-momentum=',fluid_mom_x |

thanksHello,
Thanks a lot I will try :) |

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