Java 有人能帮我理解如何模拟流体吗?
我正在尝试制作一个程序,模拟加工过程中流体的物理特性。IDE中包含了一个示例:Java 有人能帮我理解如何模拟流体吗?,java,physics,processing,Java,Physics,Processing,我正在尝试制作一个程序,模拟加工过程中流体的物理特性。IDE中包含了一个示例: /** * Fluid * by Glen Murphy. * * Click and drag the mouse to move the simulated fluid. * Adjust the "res" variable below to change resolution. * Code has not been optimised
/**
* Fluid
* by Glen Murphy.
*
* Click and drag the mouse to move the simulated fluid.
* Adjust the "res" variable below to change resolution.
* Code has not been optimised, and will run fairly slowly.
*/
int res = 2;
int penSize = 30;
int lwidth;
int lheight;
int pnum = 30000;
vsquare[][] v;
vbuffer[][] vbuf;
particle[] p = new particle[pnum];
int pcount = 0;
int mouseXvel = 0;
int mouseYvel = 0;
void setup()
{
size(200, 200);
noStroke();
frameRate(30);
lwidth = width/res;
lheight = height/res;
v = new vsquare[lwidth+1][lheight+1];
vbuf = new vbuffer[lwidth+1][lheight+1];
for (int i = 0; i < pnum; i++) {
p[i] = new particle(random(res,width-res),random(res,height-res));
}
for (int i = 0; i <= lwidth; i++) {
for (int u = 0; u <= lheight; u++) {
v[i][u] = new vsquare(i*res,u*res);
vbuf[i][u] = new vbuffer(i*res,u*res);
}
}
}
void draw()
{
background(#666666);
int axvel = mouseX-pmouseX;
int ayvel = mouseY-pmouseY;
mouseXvel = (axvel != mouseXvel) ? axvel : 0;
mouseYvel = (ayvel != mouseYvel) ? ayvel : 0;
for (int i = 0; i < lwidth; i++) {
for (int u = 0; u < lheight; u++) {
vbuf[i][u].updatebuf(i,u);
v[i][u].col = 32;
}
}
for (int i = 0; i < pnum-1; i++) {
p[i].updatepos();
}
for (int i = 0; i < lwidth; i++) {
for (int u = 0; u < lheight; u++) {
v[i][u].addbuffer(i, u);
v[i][u].updatevels(mouseXvel, mouseYvel);
v[i][u].display(i, u);
}
}
}
class particle {
float x;
float y;
float xvel;
float yvel;
int pos;
particle(float xIn, float yIn) {
x = xIn;
y = yIn;
}
void updatepos() {
float col1;
if (x > 0 && x < width && y > 0 && y < height) {
int vi = (int)(x/res);
int vu = (int)(y/res);
vsquare o = v[vi][vu];
float ax = (x%res)/res;
float ay = (y%res)/res;
xvel += (1-ax)*v[vi][vu].xvel*0.05;
yvel += (1-ay)*v[vi][vu].yvel*0.05;
xvel += ax*v[vi+1][vu].xvel*0.05;
yvel += ax*v[vi+1][vu].yvel*0.05;
xvel += ay*v[vi][vu+1].xvel*0.05;
yvel += ay*v[vi][vu+1].yvel*0.05;
o.col += 4;
x += xvel;
y += yvel;
}
else {
x = random(0,width);
y = random(0,height);
xvel = 0;
yvel = 0;
}
xvel *= 0.5;
yvel *= 0.5;
}
}
class vbuffer {
int x;
int y;
float xvel;
float yvel;
float pressurex = 0;
float pressurey = 0;
float pressure = 0;
vbuffer(int xIn,int yIn) {
x = xIn;
y = yIn;
pressurex = 0;
pressurey = 0;
}
void updatebuf(int i, int u) {
if (i>0 && i<lwidth && u>0 && u<lheight) {
pressurex = (v[i-1][u-1].xvel*0.5 + v[i-1][u].xvel + v[i-1][u+1].xvel*0.5 - v[i+1][u-1].xvel*0.5 - v[i+1][u].xvel - v[i+1][u+1].xvel*0.5);
pressurey = (v[i-1][u-1].yvel*0.5 + v[i][u-1].yvel + v[i+1][u-1].yvel*0.5 - v[i-1][u+1].yvel*0.5 - v[i][u+1].yvel - v[i+1][u+1].yvel*0.5);
pressure = (pressurex + pressurey)*0.25;
}
}
}
class vsquare {
int x;
int y;
float xvel;
float yvel;
float col;
vsquare(int xIn,int yIn) {
x = xIn;
y = yIn;
}
void addbuffer(int i, int u) {
if (i>0 && i<lwidth && u>0 && u<lheight) {
xvel += (vbuf[i-1][u-1].pressure*0.5
+vbuf[i-1][u].pressure
+vbuf[i-1][u+1].pressure*0.5
-vbuf[i+1][u-1].pressure*0.5
-vbuf[i+1][u].pressure
-vbuf[i+1][u+1].pressure*0.5
)*0.25;
yvel += (vbuf[i-1][u-1].pressure*0.5
+vbuf[i][u-1].pressure
+vbuf[i+1][u-1].pressure*0.5
-vbuf[i-1][u+1].pressure*0.5
-vbuf[i][u+1].pressure
-vbuf[i+1][u+1].pressure*0.5
)*0.25;
}
}
void updatevels(int mvelX, int mvelY) {
if (mousePressed) {
float adj = x - mouseX;
float opp = y - mouseY;
float dist = sqrt(opp*opp + adj*adj);
if (dist < penSize) {
if (dist < 4) dist = penSize;
float mod = penSize/dist;
xvel += mvelX*mod;
yvel += mvelY*mod;
}
}
xvel *= 0.99;
yvel *= 0.99;
}
void display(int i, int u) {
float tcol = 0;
if (col > 255) col = 255;
if (i>0 && i<lwidth-1 && u>0 && u<lheight-1) {
tcol = (+ v[i][u+1].col
+ v[i+1][u].col
+ v[i+1][u+1].col*0.5
)*0.4;
tcol = (int)(tcol+col*0.5);
}
else {
tcol = (int)col;
}
fill(tcol, tcol, tcol);
rect(x,y,res,res);
}
}
/**
*流质
*格伦·墨菲。
*
*单击并拖动鼠标以移动模拟流体。
*调整下面的“res”变量以更改分辨率。
*代码尚未优化,将运行得相当慢。
*/
int res=2;
int penSize=30;
国际宽度;
整数lheight;
int pnum=30000;
vsquare[]v;
vbuffer[]]vbuf;
粒子[]p=新粒子[pnum];
int pcount=0;
int mouseXvel=0;
int mouseYvel=0;
无效设置()
{
大小(200200);
仰泳();
帧率(30);
lwidth=宽度/分辨率;
lheight=高度/分辨率;
v=新的v方形[L宽度+1][L高度+1];
vbuf=新的vbuffer[lwidth+1][lheight+1];
对于(int i=0;i0&&i0&&u0&&i0&&u255)列=255;
如果(i>0&&i0&&u这篇论文是一个很好的起点,它将向您展示流体模拟背后的数学,并在第三章中描述流体解算器的实现。sourceforge中还有一个可用的工具(您需要使用cvs检查源).Hi@Miles.Java可能不是你想要的这种物理密集型应用程序的方式。此外,你可能在错误的地方问了这个问题。你可能想先学习流体物理。尝试在physics StackExchange网站上提问。(类似于StackOverflow,但适用于物理)。在开发之前,您应该首先了解您的域。希望这对您有所帮助!