If there is no derating defined for the fan, or it is 1, then it is the same as the fan curve. Operating Curve (light green line) is the derated operational curve that the simulation follows.If you used mass flow rate to define the fan, then the X-axis will be labeled as such. Fan Curve (maroon line) is the defined fan curve in the Engineering Database.It is easily resized by hovering your mouse over one of the four orange edges or corners until the mouse pointer changes, then click and drag. In the graphics window, a graph will be shown that plots out four different parameters see Image 2 below. Image 1: Show Operating Point post-processing option from the right-click context menu of a defined fan. You can easily access this through a right-click on a specific fan and choosing “Show Operating Point” from the context menu, as shown in Image 1 below. Use Environmental Pressure if a vortex crosses an opening.Since the Flow Simulation 2019 release, there is a new type of plot that you can show to see the operating point for any of the defined fans in a project. In summary, you should see no difference between Static/Total versus Environment Pressure opening boundary conditions except in the case of a vortex.
Notice that arrows point inwards and other arrows point outwards. For an example of a vortex crossing an outlet see the image below. This boundary condition treats outgoing fluid as static pressure and incoming as total pressure. Once again, only in the case of a vortex across an outlet in order to maintain conservation of energy, we use the Environmental Pressure boundary condition. When users assign total pressure, then our system loses energy. In the case of a vortex, if we assigned static pressure then our system will gain energy.
It is possible for a vortex to exist at an outlet. Steady state in a vacuum is the absence of any flow field. If the user neglects to assign a boundary condition at an opening, then the opening would be analogous to encountering a vacuum. At the boundaries of an internal flow analysis in Flow Simulation one must specify the pressure from the outside fluid as either Static or Total (depending on how the pressure was measured). In an atmosphere, fluids in an open system will always encounter another fluid. Users have two ways of defining pressure openings, either by applying a pressure value they have measured (static or total) or leaving it open to the environment. The remaining pressure opening boundary condition, Environment Pressure, is not a measured quantity. Dynamic pressure is due to the kinetic energy in the fluid. When you subtract the static pressure from the total pressure the resultant quantity is called dynamic pressure. Some devices can measure both static and total pressure. Total pressure, sometimes known as stagnation pressure, must be measured by a device that brings the flow to rest without loss. Static pressure must be measured by a device that introduces no velocity change to the flow and is most commonly measured with a manometer or a pressure gauge. Static and Total Pressure are measured quantities. What are these 3 types of pressure openings? Have you ever added boundary conditions in SOLIDWORKS Flow Simulation and wondered why there are 3 different pressure opening options? This blog is for you then! You will learn how the 3 different types ( Environmental, Static, and Total Pressure) vary in use and will have a basic understanding of when to use each.
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