tadd notes on scripting and rerunning experiments - Granular.jl - Julia package for granular dynamics simulation
(HTM) git clone git://src.adamsgaard.dk/Granular.jl
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---
(DIR) commit 0f4adf040c458ca9ea8b409b7cb1ba20c5d2bf26
(DIR) parent 76b8123dd2aaa785b6e46792988949ac0122cd9a
(HTM) Author: Anders Damsgaard <andersd@riseup.net>
Date: Sun, 12 Nov 2017 10:48:00 -0500
add notes on scripting and rerunning experiments
Diffstat:
M docs/src/man/getting_started.md | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
---
(DIR) diff --git a/docs/src/man/getting_started.md b/docs/src/man/getting_started.md
t@@ -4,8 +4,8 @@ official manual has a useful guide to [getting started with
Julia](https://docs.julialang.org/en/latest/manual/getting-started/).
In the following, two simple examples are presented using some of the core
-commands of Granular.jl. For more examples, see the scripts in the `examples/`
-directory.
+functionality of Granular.jl. For more examples, see the scripts in the
+`examples/` directory.
The relevant functions are all contained in the `Granular` module, which can be
imported with `import Granular`. *Note:* As per Julia conventions, functions
t@@ -31,9 +31,18 @@ julia> ?Granular.fitGridToGrains!
• grid::Any: Ocean or Atmosphere grid to manipulate.
• padding::Real: optional padding around edges [m].
• verbose::Bool: show grid information when function completes.
-
```
+You can go through the examples below by typing in the lines starting with
+`julia>` into the Julia interactive shell, which comes up when you start the
+Julia app or run `julia` from the command line in a terminal. Do not include
+the `julia> ` part, just the remaining text of that line.
+
+Alternatively, you can create a Julia script with the file name extension
+`.jl`. This file should contains all of the relevant commands in succession,
+which is useful for quickly repeating runs. Julia scripts can be evaluated
+form the command line using `julia <scriptname>.jl`.
+
## Collision between two particles
For the first example (`examples/two-grains.jl`), we will create two grains and
make the first grain bump in to the second grain.
t@@ -259,7 +268,13 @@ imagemagick` on macOS), the output images will be merged into an animated GIF.
### Exercises
To gain more familiarity with the simulation procedure, I suggest experimenting
-with the following:
+with the following exercises. *Tip:* You can rerun an experiment after
+changing one or more parameters by calling `Granular.resetTime!(sim);
+Granular.run!(sim)`. Changes in grain size, grain mass, or elastic properties
+require a recomputation of the numerical time step
+(`Granular.setTimeStep!(sim)`) before calling `Granular.run!(sim)`. The output
+files will be overwritten, and changes will be immediately available in
+ParaView.
- What effect does the grain size have on the time step?
- Try to make an oblique collision by placing one of the grains at a different