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--- geoscene3d:hydro_calculations:feeflow [2025/04/28 08:32] – kfu_i-gis.dk
+++ geoscene3d:hydro_calculations:feeflow [2025/12/18 15:08] (current) – [Step 1: Prepare the Layer Model in GeoScene3D] dev
@@ Line 1: / Line 1: @@
 ====== FEFLOW ======
-GeoScene3D provides a feature to export the surfaces from a layer model to a file, that can be imported into FEFLOW.
+===== Exporting a GeoScene3D Layer Model to FEFLOW =====
+ <font inherit/inherit;;#4e5f70;;inherit>FEFLOW is a finite-element based groundwater modeling software used to simulate subsurface flow and transport processes using geological layer models as a geometric framework. GeoScene3D can provide these geological layer models.</font>
-To use the feature, you first need to setup a model in FEFLOW and export a file with the points in one of the slices. The file should be of the .dat file format.
+//This workflow describes how to export a geological layer model from **GeoScene3D** and prepare it for use in **FEFLOW**.//
+==== Requirements ====
-In GeoScene3D go to "Hydro", then click on "Export Layer Model to FEFLOW..." to open the wizard.
+  * GeoScene3D **Layer Model**  (.grd)
+  * FEFLOW **Supermesh coordinate file**  (.dat)
-Click "Next" and follow the instructions in the wizard to:
+----
-  - Select the FEFLOW file
+==== Step 1: Prepare the Layer Model in GeoScene3D ====
-  - Select the surfaces from the layer model
-  - Export the file with the surface elevations
-The exported file can be imported into FEFLOW and the elevations from the GeoScene3D model can be linked to the FEFLOW model. In this way the modelling in FEFLOW is done on the model built in GeoScene3D.
+Open the Layer Model in GeoScene3D {{:geoscene3d:hydro_calculations:gs3d_fefow_start_layer_model.png?600}}//(For info on how to create a Layer Model see: [[https://wiki.geoscene3d.com/geoscene3d:building_a_layered_model|Building a layered model]])//
+//Ensure that://
+   * //All relevant layer surfaces are present//
+  * //The model geometry is complete and consistent//—-
+----
+==== Step 2: Prepare the Supermesh in FEFLOW ====
+  - Open your FEFLOW model \\ {{:geoscene3d:hydro_calculations:feflow_supermesh.png?400}}
+  - Create a **Supermesh**  covering the model area
+  - Export the **mesh node coordinates**  to an ASCII file (.dat) \\ {{:geoscene3d:hydro_calculations:feflow_ascii.png?600}}
+This file contains the **x–y coordinates**  of the mesh nodes and will later be enriched with elevation (z) values from GeoScene3D.
+----
+==== Step 3: Merge Layer Model with FEFLOW mesh (GeoScene3D → FEFLOW) ====
+  - In GeoScene3D, go to Hydro… \\ {{:geoscene3d:hydro_calculations:hydro.png?nolink&  }} \\  \\  \\ and choose Export Layer Model to FEFLOW… \\ {{:geoscene3d:hydro_calculations:hydro_export_layer_model_to_feflow.png?400}}
+  - The export wizard opens – click ''Next >''  on the **welcome **page
+  - Select the mesh coordinate file (.dat) exported from FEFLOW \\ {{:geoscene3d:hydro_calculations:mesh_coordinates.png?400}}
+  - Choose the surfaces from the **Layer Model**  to be sampled \\ {{:geoscene3d:hydro_calculations:feflow_export_layermodel.png?400}}
+  - Export the file and finish the wizard \\ {{:geoscene3d:hydro_calculations:feflow_export_finish.png?400}}
+The exported file now contains **z-coordinates sampled from the GeoScene3D layer model**, linked to the original FEFLOW mesh nodes.
+----
+==== Step 4: Import into FEFLOW ====
+  - Import the updated .dat file into FEFLOW \\ {{:geoscene3d:hydro_calculations:new_mesh.png?600}}
+  - The mesh nodes are now assigned elevations based on the GeoScene3D layer model \\ {{:geoscene3d:hydro_calculations:feflow_import.png?500}}
+==== Result: ====
+The geological surfaces from the GeoScene3D layer model are now incorporated to the FEFLOW model geo-metry. This enables groundwater flow and transport simulations in FEFLOW based on the geological model created in GeoScene3D.

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