pyrosim学习笔记

pyrosim学习笔记
pyrosim学习笔记
参数描述备注
Heat Release Rate(热The heat release rate per unit area 释放率) of
this burner.
The mass loss rate per unit area of Mass Loss Rate this burner.
At the beginning of the simulation,
this surface will not beburning. This Ramp-Up Time(增加，(暂时不明
field allows you to describe how the 上升时间) ⽩) heat releaseramps up from ambient
to the specified value.
Extinguishing This parameter governs the (喷淋系统) Coefficient(熄灭
系数) suppression of the fire by water.
The surface temperature of this Surface Temperature burner.
Convective Heat FluxThe heat flux per unit area at the (对流热通量) surface
This parameter controls how the
surface radiates heat. Usinga value Emissivity of 1.0 makes this surface a black
body. Lower valuesincreate the
amount of radiated heat.
参数描述备注
Enable this option to emit particles Emit Particles from the surface.
Particle Type Select a particle to emit.
Controls the number of particles Number of Particles inserted per second. A valueof 1 per Cell will insert one particle per cell per second.
For particles that have mass, this ⽔ Mass Flux option provides an alternate
Layered(分层)
Layered surfaces are composed of one or more material definitions. Materials include
solid andliquid substances such as concrete(混泥⼟), pine(松⽊), and ethanol(⼄醇).
Backing
The backing of a surface is the boundary condition behindthe surface. The default value, Air Gap represents an air gap, Exposed will allow the surface to transfer heat into the space behind the wall, and Insulated prevents any heat loss from the back of the material.
Material Composition
Within a layer (row), you can specify multiple materials based on
mass fraction. For example, to specify a layer that is just brick, type 1.0 BRICK (assuming you have created a
material called BRICK). To specify a layer of wet brick, you could enter 0.95 BRICK; 0.05 WATER. Each material is separated by a semi-colon.
Porous(能穿透)
The property is generally used to create a fan using a thin obstruction.
Enable Leakage
This option allows you to select two pressure zones for leakage across the surface.
Air Leak
Air leak surfaces can be used to create a permeable barrier between two pressure zones. The porous option is available to allow air movement to occur across this obstructions using this surface.
Adding Textures to Surfaces
You can add textures to surfaces to increase the realism of your model. Some default textures are provided or you can import your own. The Room Fire example demonstrates using a wood texture for a pine floor and hanging a picture on a wall. Your textures will be automatically displayed in PryoSim; to display textures in Smokeview, select Textures on the
Show/Hide menu.
To define a texture:
1. On the Model menu, click Edit Surfaces....
2. Either create or edit the surface to which you want to add a texture.
3. Click on the Texture box.
4. Either select a pre-defined texture or click the Import... button and select your own image file.
5. The image you selected will be displayed. Under the image, click the Details tab. Set
the
Width and the Height values to correspond to size to be used in the PyroSim model.
Obstruction Properties
Smooth
Prevents vorticity(漩涡) from being generated at the corners. This option is used to prevent flow problems along angled walls due to the stair-stepped(楼梯), rectilinear geometry used by FDS.
Record BNDF
When this option is selected, this object is included in boundary data output.
Chapter 14. Activation Events
Activation events使⽤状况:
1. 模拟门在某个时间打开;
2. 模拟窗在某个时间打开;
3. 模拟通风系统在某个时间开启;
Chapter 15. Output Controls
Solid Profiles
测量固体的温度和密度。

这固体表⾯必须定义为有热传导的，如果表⾯不是热传导的，则此
定义的将会在模拟开始前输出个错误消息并退出。

Slices
测量⽓体某⼀个平⾯的温度，速度，压⼒。

Slice files may be viewed in Smokeview by selecting Load/Unload-
>Slice file. Boundary Quantities
测量每个阻碍物的温度。

To view boundary data in Smokeview (e.g. wall temperature), right-click to open the menu, then select: Load/Unload->Boundary File-
>WALL_TEMPERATURE.
Isosurfaces(等值⾯)
描绘三维的⽓象⼯程量。

To view isosurface data in Smokeview, right-click to open the menu, then select: Load/Unload->Isosurface File-
>TEMPERATURE。

Plot3D Data
可以显⽰⼆维的速度，热量释放率，温度等。

Statistics
Chapter 4. Meshes
Working with meshes
要求建模的每个物体都必须再⽹格内，最好的计算是物体边界贴近⽹格。

如果有超出⽹格的物体，虽然不会出现任何警告，但是在烟⽓模拟中不会出现超出⽹格边界的物体。

由于FDS采⽤泊松分布进⾏计算，所以要求将⽹格划分为2，3，5的倍数(99除外)。

当划分不是这些数字倍数时，软件将提出警告。

⽹格划分分为两种模式。

1.统⼀模式，⼀个体积进⾏统⼀划分，⽹格⼤⼩⼀样。

2.不统⼀模式，⼀个体积上允许存在不同⼤⼩的⽹格。

Use multiple meshes
以下⼀些原因可能要选⽤多重⽹格:
1. 使⽤多个处理器同时计算;
2. 有时候为了节约计算时间，⼀些不重要的空间可以使⽤相对粗糙的⽹格。