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--- ezan [2025/04/03 13:20] – created admin
+++ ezan [2025/04/04 12:17] (current) – [2-D Fortran CFD code for tornado-like vortices] admin
@@ Line 1: / Line 1: @@
-===== 2-D =====
+===== 2-D Fortran CFD code for tornado-like vortices =====
-{{url>https://12characters.net/intense.html}}
+The source code is here: [[https://github.com/bfiedler/ezan | at github]]
+The **eza** in the name is for //easy axisymmetric//. Perhaps **n** is //new// and **3** is version?
+I believe this code is what I used as the companion axisymmetric code in {{ :tornadobox:suction_vortices_and_spiral_breakdown_in_numerical.pdf | my 2009 QJ article}}.
+It produces slightly difference results than the code for [[https://12characters.net/anim2dvort/ | axisymmetric simulations prior to 2009]], mainly because the viscosity profile was simplified for compatibility with the  [[tornadobox|3-D Fortran CFD code for tornado-like vortices]].
+<code>
+wget https://github.com/bfiedler/ezan/blob/main/ezan3_2025.tar.gz
+gunzip ezan3_2025.tar.gz
+tar xvf ezan3_2025.tar
+cd ezan3_2025
+./Runall
+</code>
+This will require about 15 minutes of wall clock on an ancient PC with an i7 chip.
+==== Domain and grid ====
+^{{ :ezan:wholedomain.png?direct |}}^
+|The r-z plane of the cylindrical domain. The perpetual buoyancy the drives the flow is contoured. The stretched grid is shown.|
+==== Time history of extremes ====
+{{ ::ezan:nosliphist.png?direct |}}
+==== Animation of entire time ====
+{{url>https://12characters.net/noslip.html  98%,650}}
+==== Zoom in time and space ====
+Note the change in contour intervals, so the extremes can be detected.
+{{url>https://12characters.net/intense.html  98%,650}}