# tree modeling using porous media **URL:** \ **Category:** Using SimScale\ **Created:** [October 18, 2025, 11:23pm UTC](https://www.simscale.com/forum/t/tree-modeling-using-porous-media/100476 "2025-10-18T23:23:27Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![apilevar](https://www.simscale.com/forum/letter_avatar/apilevar/32/5_5575768a8748004e209b776fc1b2916d.png) [@apilevar](https://www.simscale.com/forum/u/apilevar)\ **Post date:** [October 18, 2025, 11:23pm UTC](https://www.simscale.com/forum/t/tree-modeling-using-porous-media/100476/1 "2025-10-18T23:23:27Z")
I want to simulate a new type of tree and bushes using porous media. I know that there are presets of trees in PwC but I want to model a new tree. I need help in how to define the porous media of the tree. Which type (attached image) to choose and how to calculate based on the tree leaf index or density. ![qsn](https://www.simscale.com/forum/uploads/default/original/3X/c/a/cafa69a672f3e200171121a9025603c752e2d12c.png) ---
**Author:** ![Ricardopg](https://www.simscale.com/forum/user_avatar/www.simscale.com/ricardopg/32/26909_2.png) [@Ricardopg](https://www.simscale.com/forum/u/Ricardopg)\ **Post date:** [October 18, 2025, 11:26pm UTC](https://www.simscale.com/forum/t/tree-modeling-using-porous-media/100476/2 "2025-10-18T23:26:20Z")
Hi, You can find the formulation from the tree porous media here: [Surface Roughness & Porosity | Advanced Modelling PWC | SimScale](https://www.simscale.com/docs/analysis-types/pedestrian-wind-comfort-analysis/advanced-modelling/#tree-model) If you carefully look at the equations, you will notice that this is a Forchheimer model (i.e. [Darcy-Forchheimer](https://www.simscale.com/docs/simulation-setup/advanced-concepts/porous-media/#darcy-forchheimer-medium) with d = 0). As such, you can derive Darcy-Forchheimer coefficients based on a given tree configuration. Cheers