1. RGFGRID

RE: How to deal with islands?

2021-03-17T09:10:57Z

Hi there,we too are very keen to see this resolved. This sort of usage seems like a common and fairly fundamental application of D3D FM and the method Dano demonstrates shows it can be done very efficiently (https://www.youtube.com/watch?v=aBFH1vWCO90&t=), but that functionality has now been removed. Surely D3D is not just for rivers? ;) Please bring back those operations!

RE: How to deal with islands?

2020-11-04T12:12:55Z

Hi everybody,
is there anything new to say about this issue? It has been almost a year since the thread creation without answer.
Thank you very much,
David

RE: How to deal with islands?

2019-10-30T17:01:25Z

I agree, we will like to know how to deal with the Islands. Also on the version of RGFGRID 6.01 I am not able to refine equidistant the polygon, it wants me to refine the segments. I am sure there is another way as when the time to do several Islands this will be quite time consuming. Thanks a lot in advance. Best, Angel

How to deal with islands?

2019-02-25T10:41:09Z

It appears that the behaviour of RGFGRID with multiple polygons as shown in this video by Dano is not present anymore in its latest iteration (I'm using the 2019.1 release, 5.05.00.59437): https://www.youtube.com/watch?v=aBFH1vWCO90&t=

I'm not sure when this disappeared but in the RGFGRID version coming with Delft3D 4.02.03 it works as in the video. In the 2019.1 version it either makes just a grid in the island polygon or covers it with a coarse grid.

How are islands supposed to be dealt with 'nowadays'?

RE: How to import Grid(D-Flow FM) into Delft 3D-Flow

2019-01-28T09:48:27Z

Hello. I have this problem too. I switch irregular grid into regular grid but lots of area of my unstructured grid removed. How can I use this full unstructured grid in Delft3D-Flow when input file has no _net.nc ?

Thanks for answering to my question.

Converting Grid Coordinates from "UTM Zone 36N" to "Pseudo Mercator 3857"

2018-11-27T19:13:28Z

Sine i have many projects already conducted in Delft3d with a great efforts already done in generating the grid in our zone coordinate. So, i was trying to convert the "Grid" file to "Pseudo Mercator 3857" coordinate which is being used in Delft3d-FM, However conversion is available for LDB and samples files, but not for "Grid file" whether regular or irregular type. I have also tried to convert the grid using "Super trans" however, its not AVALIABLE for "Pseudo Mercator 3857" coordinate.I am using version 1.4.3

RE: How to import Grid(D-Flow FM) into Delft 3D-Flow

2018-07-19T11:18:50Z

Dear Mahatma,

When converting a grid from irregular to regular (or vice versa) only the colour of the grid changes. It changes from dark blue (structured grid) to light blue (unstructured grid). Also at the corner point the nodes become visible in case of an unstructurerd grid. The grid itself doesn't change, which might suggest that nothing has happened, which is not true. The status has changed to another 'mode' and other commands have become active; see the commands in grey (inactive) and black (active).

With kind regards,

Erik de Goede, Deltares

RE: How to import Grid(D-Flow FM) into Delft 3D-Flow

2018-06-09T19:31:48Z

Hi Erik.

The option "Convert Grid -> Irregular to regular" doesn't make effect. Do I have to do something before with my grid?

RE: make mesh density finer at certain area

2017-10-18T09:27:58Z

Dear Seungjin Baek,

Indeed, this is what happens if "Refine Casulli" is applied. A cell is split in three parts: 25%, 50% and 25 %. This is what you see in your refined area. In a next step you have to orthogonalize the polygon ares. Then, it will look better;see the attachment.

Erik de Goede, Deltares

RE: make mesh density finer at certain area

2017-09-15T23:32:19Z

Erik de Goede:

Dear Seungjin Baek,

Did you try 'Refine Casulli'? See Section 5.3.12 of the RGFGRID User Manual. In this way, you can locally refine the grid.

Erik de Goede, Deltares

This is what I got from using 'Refine Casulli'

1) first image - uniform density of mesh

2) second image - after I used 'Refine Casulli'
It creates weird cell configurations in the area wrapped by a polygon. I would like to have quadrilateral cells for the area I surrounded by the polygon which represents a channel.
Can it not be possible?

3) third image - as in the banner of this website up top. I would like to have a nice combination of quads for channel and triangles for floodplains..
This process is very easy with MIKE mesh generator, but RGFGRID seem to be hard to create this formation, or I must be missing something here.

RE: make mesh density finer at certain area

2017-09-15T08:40:00Z

Dear Seungjin Baek,

Did you try 'Refine Casulli'? See Section 5.3.12 of the RGFGRID User Manual. In this way, you can locally refine the grid.

Erik de Goede, Deltares

make mesh density finer at certain area

2018-01-10T11:16:40Z

Dear all,

I couldn't find any tutorial or solution to make certain area of flexible mesh finer than everywhere else. For example, I would like to make the river and flood plain with finer mesh while keeping the remaining area with coarser triangles.

I tried everything I could on RGFGRID, but I don't seem to be able to fine the solution.

I first create mesh using polygon -> nicely uniform mesh is created.
Then I create another polygon in the middle, then tried mesh creation again, but from this point on, there are various error messages and outcome are different every time. Sometimes it creates mesh with holes with the polygon I just drew. Sometimes it creates a new mesh on top of the existing mesh - with nodes not connecting at all..

I'm frustrated and I find the Delft3D user guide to be extremely lacking many details.

RE: Bathymetry

2017-03-06T10:23:30Z

Dear Alejandro Paladio,

Great to hear that it works for you. Thanks.

Kind regards,

Jing Zhao
Deltares

RE: Bathymetry

2017-03-04T02:05:09Z

Hi Jing Zhao,

Thank you for your answer, I have no trouble on running the hydrodynamic module.

Greetings

RE: Bathymetry

2017-02-24T11:07:41Z

Dear Alejandro Paladio,

You could find answers in chapter of tutorials of the FM user manual, see here: http://content.oss.deltares.nl/delft3d/manuals/D-Flow_FM_User_Manual.pdf#chapter.18

Please let us know if there is still any problems.

With kind regards,

Jing Zhao
Deltares

Bathymetry

2017-02-23T23:10:13Z

Hey everyone,

Hope all are doing great, I am now working with Delft3D FM... and I don't know where can I create the depth file (like the one in Delft3D that you create using Quickin)...
Sorry for my basic questions:

1) how can I create my depth file for FM... (do I use RGFGRID?)
I attach an image... I created the grid myself, I also made the .xyz file using AutoCAD and other tools...
I want to simulate sediment transport in this "lagoon", by just using tides...

2) I would also like to know... if m grid is ok, because I would like to take into account a little bit over the landboundary (over 0)...
I would like to see flooding in a future example, and I want to create a better grid.

3) So, I don't quite get it now, but, how does Delft FM takes the points that are negative and those which are positive...

thanks in advance
greetings

RE: Regarding GRIDS!!

2017-01-06T08:59:59Z

Dear Gazi Md. Amin,

If you encounter problems with the software (model crashes, strange results,...), then we will help you (by e-mail) because your institute has a Delft3D Service package.
For 'how to apply the Delft3D software' you can use this forum. Then, other users hopefully will respond with tips how to do this. We would like to mention that you could also follow Delft3D courses; see for example https://www.deltares.nl/en/academy/delft3d-block-2a/.

With kind regards,
Erik de Goede, Deltares

RE: Regarding GRIDS!!

2017-01-06T04:27:29Z

Thanks for your kind reply What if I face any kind of any kind of problem further? How should I contact you? By mail and by asking here?

RE: Regarding GRIDS!!

2017-01-05T10:59:05Z

Dear Gazi Md. Amin,

For your questions, you could watch some tutorial videos here: http://oss.deltares.nl/web/delft3d/screen-casts

Moreover, you could refer to Sections 18.1, 18.2 and 18.3 in the user manual.

With kind regards,

Jing Zhao
Deltares

RE: How to import Grid(D-Flow FM) into Delft 3D-Flow

2017-01-05T09:04:18Z

Dear Jian Gao,

In RGFGRID you can switch between structured and unstructured grids via "Operations" and then "Convert grid", for which there are two options: "Regular to irregular" or ""Irregular to regular". When saving a grid (i.e. exporting) you can only save a structured grid in "Grid(RGFGRID)" and an unstructured grid in "Grid(D-Flow FM)" format. An unstructured grid cannot be saved in the structured format "Grid(RGFGRID)".

With kind regards,

Erik de Goede
Deltares