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Fix some issues related to the Courant number

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step_h was using the wrong timestep; fixing it caused update issues
based on the Courant number being 1.0, i.e. too large. Reducing it to
\sqrt{3}/3 fixes stability issues. Unfortunately, a non-Unity Courant
value prevents me from using the ideal Absorbing Boundary Condition I
had just implemented, so that's been disabled.
This commit is contained in:
Colin
2020-10-03 19:39:45 -07:00
parent c33317c805
commit 0642f52172
4 changed files with 158 additions and 63 deletions
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19
src/render.rs
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@@ -5,7 +5,7 @@ use crate::mat;
use crate::sim::{Cell, GenericSim};
use crate::meas::AbstractMeasurement;
use font8x8::{BASIC_FONTS, GREEK_FONTS, UnicodeFonts as _};
use log::trace;
use log::{trace, info};
use image::{RgbImage, Rgb};
use imageproc::{pixelops, drawing};
use std::fs::File;
@@ -62,8 +62,14 @@ struct RenderSteps<'a> {
impl<'a> RenderSteps<'a> {
fn render(state: &'a dyn GenericSim, measurements: &'a [Box<dyn AbstractMeasurement>], z: u32) -> RgbImage {
let width = 768;
let height = width * state.height() / state.width();
let mut width = 1920;
let mut height = width * state.height() / state.width();
if height > 1080 {
let stretch = 1080 as f32 / height as f32;
width = (width as f32 * stretch) as _;
height = 1080;
}
trace!("rendering at {}x{}", width, height);
let mut me = Self::new(state, measurements, width, height, z);
me.render_scalar_field(10.0, false, 2, |cell| cell.mat().conductivity().mag());
me.render_scalar_field(100.0, true, 0, |cell| cell.mat().m().mag());
@@ -161,9 +167,10 @@ impl<'a> RenderSteps<'a> {
for x in 0..8 {
if (bmp & 1 << x) != 0 {
let real_x = 2 + i as u32*8 + x;
let real_y = y as u32 + self.im.height() - 10 - meas_no as u32 * 8;
if real_x < self.im.width() {
self.im.put_pixel(real_x, real_y, Rgb([0, 0, 0]));
if let Some(real_y) = (y as u32 + self.im.height()).checked_sub(10 + meas_no as u32 * 8) {
if real_x < self.im.width() {
self.im.put_pixel(real_x, real_y, Rgb([0, 0, 0]));
}
}
}
}