![A tree exchanges momentum with the atmosphere. Image via [Pixabay](https:/pixabay.com)](https://cdn.pixabay.com/photo/2018/03/14/09/49/tree-3224754__340.jpg) # The aerodynamic drag of a tree This folder contains pages that concern the aerodynamic modeling of leafless trees. This is part of a bigger research project named [Plantenna](https://www.4tu.nl/plantenna/en/). ![](plantenna/letters.mp4)(autoplay style="pointer-events: none; ) ## Simulations * [Flow past a 2D cylindrical branch](cyl2d.c) * [Flow past two 2D cylindrical branches](2cyl2d.c) * [A rapidly growing tree](add_branches.c) * [Flow past a 3D cylindrical branch](cyl3d.c) * [Flow past a fractal tree](fractaltree.c) * [Flow past a space-colonized tree](404) * (some increasingly complex pages) * [Flow past realistic tree geometries](404) ## Cell-fraction embedded-tree pages * [A Simple fractal](tree-test.c) * [A tree generated with space colonization](colonizedtree.c) * [A "real tree" from line-segment skeleton (via `QSMTREE`)](realtree.c) * [A "real tree" from a `.stl` file (via `Adtree`)](mekel.c) ## Methods * [Generate a fractal tree and volume fractions from line-segment skeleton](treegen.h) * [Minimal example of $\Delta \propto R^{-0.5}$ with `adapt_wavelet()`](rc2.c) * [Example of $\Delta R^{-1} = c \times Re^{-0.5}$ on 3 branches](branchrefine.c) * [Frontal area of a fractal tree](projecttree2D.c) * [Space colonization](colonization.h) ## Miscellaneous pages * [A model for a growing plant root](tc.c) * [Write "Plantenna" with a growing plant-root font](plantenna.c)