一维非稳态无内热源导热程序理论部分前文已述,对应教学视频已述。1D显式内部节点迭代格式如下:
常物性无内热源一维非稳态温度场,其中计算域两端温度分别为1℃和0℃。计算程序如下:
Array.create = function(dimension, initialValue){
var arr = [];
for(var i=0;i<dimension;i++){
arr[i]=initialValue;
}
return arr;
};
Array.prototype.clone = function(){
var arr=[];
for(var i=0,len=this.length;i<len;i++) {
arr.push(this[i]);
}
return arr;
}
var Solution=function(tmpr){
this.tmpr=tmpr;
this.SetUpGeometryAndMesh=SetUpGeometryAndMesh;
this.SetUpBoundaryCondition=SetUpBoundaryCondition;
this.Solve=Solve;
};
function SetUpGeometryAndMesh(dx){
tmpr=Array.create(50+1,0);
for(var i=0;i<50+1;i++){
xs.push(i*spaceStep);
}
}
function SetUpBoundaryCondition(dx){
tmpr[0]=1;//左侧
tmpr[50]=0;//右侧
}
function Solve(timeStep,iterations){
var a=1;//热扩散系数
for(var iter=1;iter<iterations+1;iter++){
for(var i=1;i<50;i++){
tmpr[i]=tmpr[i]+timeStep*a*(tmpr[i+1]+tmpr[i-1]-2*tmpr[i])/spaceStep/spaceStep;
}
if(iter==101) T50s=tmpr.clone();
if(iter==201) T100s=tmpr.clone();
if(iter==301) T150s=tmpr.clone();
}
}
var tmpr=[],T50s,T100s,T150s,xs=[],flowTime=0,timeStep=0.5,iterations=301;
var spaceStep=1;//网格dx
function getHeat1DProfile(){
var solution=new Solution(tmpr);
solution.SetUpGeometryAndMesh(spaceStep);//网格
solution.SetUpBoundaryCondition(spaceStep);//设置边界条件
solution.Solve(timeStep,iterations);//求解
return [xs,T50s,T100s,T150s];
}
module.exports = {
getHeat1DProfile: getHeat1DProfile
}
上述程序是小程序新工科课程设计HTML5小程序里自带程序,运行效果如下:
但上述代码没有后处理部分,要注意的是显式迭代格式时间步长太长会导致计算发散!。来一段BGM,如果能看懂代码,说明《传热学》导热部分入门了。
这里给出包含有后处理的所有代码:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>有限差分法计算一维常物性无内热源非稳态温度场</title>
</head>
<body>
<div style="width:500px; height:auto; float:left; display:inline">
<canvas id="tmprChart" width="500" height="400">
Your browser does not support HTML 5 Canvas.
</canvas>
</div>
<script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/echarts.min.js"></script>
<script type="text/javascript">
Array.create = function(dimension, initialValue){
var arr = [];
for(var i=0;i<dimension;i++){
arr[i]=initialValue;
}
return arr;
};
Array.prototype.clone = function(){
var arr=[];
for(var i=0,len=this.length;i<len;i++) {
arr.push(this[i]);
}
return arr;
}
var Solution=function(tmpr){
this.tmpr=tmpr;
this.SetUpGeometryAndMesh=SetUpGeometryAndMesh;
this.SetUpBoundaryCondition=SetUpBoundaryCondition;
this.Solve=Solve;
this.ShowResults=ShowResults;
};
function SetUpGeometryAndMesh(dx){
tmpr=Array.create(50+1,0);
for(var i=0;i<50+1;i++){
xs.push(i*spaceStep);
}
}
function SetUpBoundaryCondition(dx){
tmpr[0]=1;//左侧
tmpr[50]=0;//右侧
}
function Solve(timeStep,iterations){
var a=1;//热扩散系数
for(var iter=1;iter<iterations+1;iter++){
for(var i=1;i<50;i++){
tmpr[i]=tmpr[i]+timeStep*a*(tmpr[i+1]+tmpr[i-1]-2*tmpr[i])/spaceStep/spaceStep;
}
if(iter==101) T50s=tmpr.clone();
if(iter==201) T100s=tmpr.clone();
if(iter==301) T150s=tmpr.clone();
}
}
function ShowResults(){
var dom = document.getElementById("tmprChart");
var tmprChart = echarts.init(dom);
var tmprOption = {
//title: {text: '温度分布'},//图标题
tooltip: {trigger: 'axis'},//提示信息
xAxis: {type: 'category',data: xs,},yAxis: {type: 'value'},//x坐标和y坐标
series: [{name:'time=50s',data: T50s,type: 'line'},
{name:'time=100s',data: T100s,type: 'line'},
{name:'time=150s',data: T150s,type: 'line'},],
legend: {data:['time=50s','time=100s','time=150s',]},//图例文字
toolbox: {feature: {saveAsImage: {}}},//设置保存图片按钮
};
tmprChart.setOption(tmprOption, true);
}
var tmpr=[],T50s,T100s,T150s,xs=[],flowTime=0,timeStep=0.5,iterations=301;
var solution=new Solution(tmpr);
var spaceStep=1;//网格dx
solution.SetUpGeometryAndMesh(spaceStep);//网格
solution.SetUpBoundaryCondition(spaceStep);//设置边界条件
solution.Solve(timeStep,iterations);//求解
solution.ShowResults();//绘制结果
</script>
</body>
</html>
将以上代码保存到文本文件,后缀名改为html,点击运行结果如下:
程序完整源代码及演示请猛戳这里: https://songxp03.github.io/SimFun/
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