intro story D-Flow FM


D-Flow Flexible Mesh

D-Flow Flexible Mesh (D-Flow FM) is the new software engine for hydrodynamical simulations on unstructured grids in 1D-2D-3D. Together with the familiar curvilinear meshes from Delft3D 4, the unstructured grid can consist of triangles, pentagons (etc.) and 1D channel networks, all in one single mesh. It combines proven technology from the hydrodynamic engines of Delft3D 4 and SOBEK 2 and adds flexible administration, resulting in:

  • Easier 1D-2D-3D model coupling, intuitive setup of boundary conditions and meteorological forcings (amongst others).
  • More flexible 2D gridding in delta regions, river junctions, harbours, intertidal flats and more.
  • High performance by smart use of multicore architectures, and grid computing clusters.
An overview of the current developments can be found here.
The D-Flow FM - team would be delighted if you would participate in discussions on the generation of meshes, the specification of boundary conditions, the running of computations, and all kinds of other relevant topics. Feel free to share your smart questions and/or brilliant solutions! 


We have launched a new website (still under construction so expect continuous improvements) and a new forum dedicated to Delft3D Flexible Mesh.

Please follow this link to the new forum: 

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.





Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems


Message Boards


  • 4 Go-To Apps For Revision and Exam Prep

    After so many weeks of writing essays, reports, term papers, and other academic assignments, it is high time to start revising for exams. This period of student life is really tough, especially for those who were not serious enough with the classroom activities. Students who didn’t take notes during lectures have much trouble preparing for the exams. As a rule, their memory isn’t sharp enough to keep in mind all the details their professor said. Learners struggle a lot before their exams. They have to spend long hours in libraries reading a pile of sources and doing thorough research. Don’t want to be among those students who have their hands full? Benefit from the most popular academic help apps that will make revision more effective and less stressful. Download them to your mobile phone and revise for college exams like a pro. Study Blue If you are a fan of flashcards, consider a study application Study Blue. It is a free app, so you can download it to your device and get quick help from the crowdsourced library of materials. This app can be used to make and share flashcards, to add audio and images to your study materials, to check the knowledge of the subject taking tests and keeping progress. After downloading this app, you’ll have access to an impressive library of materials for studying and helpful guides, created by students. <a href="">SpeedyPaper Adviser</a> One more useful application for all students is SpeedyPaper Adviser. This writing app will help you boost your grades and prepare for exams more effectively. Having SpeedyPaper Adviser on your phone, you will get unlimited access to the huge database of college and university papers. You will be able to have a look at samples of various academic assignments. Find necessary essays, reports, research papers, course works, and boost your grades. Students will know how to create, to structure, and to cite assignments. The customer support is available round-the-clock, so if you have trouble finding a required paper, you may contact managers and ask all your questions. Numerous positive reviews about this app prove that it is really great and worth giving a try. To know about all the features, download an app on your handy or visit their website. Gojimo This application was created to help students have a smooth revision. Undergraduates can use Gojimo both online and on mobile devices. An app contains helpful content for learners and some quizzes. You can select an exam you want to revise for, and it goes with a list of questions you may be asked. If you haven’t found a required topic, you can get in touch with the support via instant messaging. Quizlet It is one more helpful application for students who are going to prepare for exams. It is free, easy to use, and is a good choice for self-study. Having Quizlet on your device, you can learn with the help of flashcards, share them with your peers, learn foreign languages and get more info about coding, mathematics, science, history, and other college subjects. A lot of students benefit from Quizlet and leave their positive reviews about this study app.
    0 Subcategories 0 Threads
  • Cohesive sediments & Muddy systems

    0 Subcategories 43 Threads
  • Compilation Error with Delft3D source code Version 7545 in ubuntu 19.04.

    Dear All, I am getting stuck with below error while I am compiling the Delft3D source code Version 7545 in ubuntu 19.04. Please help me to fix this error. io_ugrid.F90:66:46: 66 | character(len=ug_idsLen) :: ids | 1 Error: Component ‘ids’ of BIND(C) type at (1) must have length one io_ugrid.F90:67:52: 67 | character(len=ug_idsLongNamesLen) :: longnames | 1 Error: Component ‘longnames’ of BIND(C) type at (1) must have length one io_ugrid.F90:55:46: 55 | character(len=ug_strLenMeta) :: institution | 1 Error: Component ‘institution’ of BIND(C) type at (1) must have length one io_ugrid.F90:56:41: 56 | character(len=ug_strLenMeta) :: source | 1 Error: Component ‘source’ of BIND(C) type at (1) must have length one io_ugrid.F90:57:45: 57 | character(len=ug_strLenMeta) :: references | 1 Error: Component ‘references’ of BIND(C) type at (1) must have length one io_ugrid.F90:58:42: 58 | character(len=ug_strLenMeta) :: version | 1 Error: Component ‘version’ of BIND(C) type at (1) must have length one io_ugrid.F90:59:44: 59 | character(len=ug_strLenMeta) :: modelname | 1 Error: Component ‘modelname’ of BIND(C) type at (1) must have length one make[5]: *** [Makefile:538: io_ugrid.lo] Error 1
    0 Subcategories 0 Threads
  • dispersion of radionuclides

    Dear all, I'm beginner in DELFT 3D and I'm working on the dispersion of radionuclides. Please help me with the following issues. 1- Regarding the “DELWAQ” module, is it reasonable to study the dispersion of conservative radionuclide (which their transport equation is mainly the advection-diffusion Eq.) via coupling a transport code to DELFT 3D? or does DELFT have the ability to do such a simulation by itself? 2- If the coupling is reasonable, is it possible to define the advection-diffusion Eq. by means of a UDF and using its variables or is it doable trough the source code of DELFT? Is there a complete access to the source of the code? 3- By using UDF for this purpose, is it necessary to define certain kind of input data for UDF? or do we only use the computed current data from DELFT as input data for transport calculations in the UDF? Your assistance in this matter is greatly appreciated.
    0 Subcategories 3 Threads
  • Far-Field Tsunami

    Trans-Oceanic modeling and observations using DDB
    0 Subcategories 2 Threads
  • i didnt received any mail link to download theDelft3d GUI

    Dear sir I have submitted the request form online from my account, but I didnt received any email to give me a link in order to download DELFT3D GUI. How many days it will take? How can I do if I dont receive the link?
    0 Subcategories 0 Threads
  • kneigel.x

    Open Boundaries
    0 Subcategories 0 Threads
  • Research and technical documents

    0 Subcategories 3 Threads
Showing 1 to 8 of 8 entries.
Showing 1 to 20 of 922 entries.