.gitignore

node_modules

Dv960KcUYAAGJru.png

index.js

#!/usr/bin/env node

const sprintf = require('sprintf-js').sprintf;
const asciichart = require ('asciichart')

// TANK 
// Small Lateral Aperture Simulation

const parameters = {
    'apertureHeight': 0.001, //  height of ap
    'density': 1000, //water density (kg/m3)
    'diameter': 0.1, // 0.01 m diameter of outlet meters
    'volumetricFlow': 0, 
    'gravity': 9.81, // acceleration of gravity (9.81 m/s2)
    'k' : 0.97 * 0.97, // discharge coefficient: velocity coefficient (water 0.97) * contraction coefficient (well rounded aperture 0.97)
    'maxTime': 60,
    'waterLevel': 1, // 1 meter height of tank
    aperture() {
        return Math.PI * Math.pow((this.diameter/2),2);
    },
    shoot(priorHeight){
        return 2 * Math.pow(priorHeight * this.apertureHeight,0.5);
    },
    newVolumetricFlow(priorLevel){
        let flow = this.k * this.aperture() * Math.pow(2 * this.gravity * priorLevel,0.5);
        this.waterLevel =( priorLevel - flow < 0 )? 0 : priorLevel - flow ;
        this.volumetricFlow = flow;
        return flow;
    },
    newWaterLevel(timestep,outFlow){ 
        let wl = (this.waterLevel - outFlow);
        if ( timestep > 0) return wl;
        if ( wl < 0) return 0;
        return this.waterLevel_0 ;
    },
    backForce(){
        return this.density * this.volumetricFlow * this.velocity;
    } 
}

const s0 = new Array (parameters.maxTime);

process.stdout.write("\u001b[2J");     
process.stdout.write("\u001b[0;0H\n"); 
process.stdout.write(sprintf('%s:   %s:     %s:\n', 'TIME', 'LEVEL', 'FLOW'));
process.stdout.write(sprintf('%s\n', '-------------------------'));

for (let timestep = 0; timestep < parameters.maxTime || this.waterLevel === 0 ; timestep++) {
    s0[timestep] = parameters.waterLevel * 10;
    const params = sprintf('%03f     %03.4f     %04.4f\n', 
        `${timestep}`, 
        `${parameters.waterLevel}`, 
        `${parameters.volumetricFlow}`
    )
    const ellipsis = sprintf(' %s         %s          %s\n', 
        `⋮`, 
        `⋮`, 
        `⋮`
    )
    if (timestep < 3 || timestep > parameters.maxTime - 4 ) {process.stdout.write( params )}
    else if (timestep < 4  || timestep > parameters.maxTime - 4 ) {process.stdout.write(ellipsis)}
    parameters.newVolumetricFlow(parameters.waterLevel)
    parameters.newWaterLevel(timestep,parameters.volumetricFlow)
}

process.stdout.write(sprintf('%s\n', '-------------------------'));
process.stdout.write('\n');

console.log (asciichart.plot (s0),'\n')

package.json

{
  "name": "sim-tank",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "bin": "./index.js",
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "asciichart": "^1.5.7",
    "sprintf-js": "^1.1.2"
  }
}