Solidworks flow simulation negative pressure warning

#Solidworks flow simulation negative pressure warning software

The power input from the motor required to pump that amount of air is determined by the following calculation: This is a vacuum relative to the specified 101.3-kPa ambient pressure. The average pressure over that face is 100.4 kPa, as shown in Figure 12. To calculate the inlet pressure, the inner surface of the inlet lid is selected as the reference geometry, and we select РІР‚СљPressureРІР‚Сњ as the required quantity. We are interested in the inlet pressure since that will give the amount of vacuum the pump must draw to move the specified 0.3 m 3/s of air.Р”Р‡igure 11. Right-clicking the Surface Parameters in Figure 10 brings up the dialog box in Figure 11. We will evaluate the pressure drop by querying surface results at the inlet and outlet surfaces. The pump in our example uses a motor to drive the impeller (Figure 1), which pulls suction on the inlet (P s).

The function of a pump is to drive a given flow from a lower pressure to a higher pressure using energy from an attached motor. We are now ready to solve the model by selecting Tools РІвЂ вЂ™ Flow Simulation РІвЂ вЂ™ Solve РІвЂ вЂ™ Run from the menu. From the boundary condition dialog box (ToolsР’В РІвЂ вЂ™ Flow Simulation РІвЂ вЂ™ Insert РІвЂ вЂ™ Boundary Condition), we select the pump casing as the stationary item (see Figure 9).Р”Р‡igure 9. We need to make the pump housing stationary to mimic the actual operation of the equipment. This will, by default, impart a rotation on all of the fluid and solid components. Recall that we specified a global rotation of 2,000 rpm in the model setup. The final boundary condition is the most critical. The outlet is defined on the outlet lid surface as shown in Figure 8 by setting the Environment Pressure to ambient (10,325 kPa) on this surface.Р”Р‡igure 8. We will define this boundary condition at the inlet lid face of the model as shown in Figure 7. The pump will be required to produce a flow of 0.3 m 3/s. The air can be seen contouring the blades of the impeller. With the Show Fluid option of the geometry check activated, we get the display as shown in Figure 6. To ensure the geometry is modeled correctly for the Flow Simulation to continue, a model check is performed (Tools РІвЂ вЂ™ Flow Simulation РІвЂ вЂ™ Tools РІвЂ вЂ™ Check Geometry). The fluid that we are pumping is air, and we add it to the Project Fluids definition as shown in Figure 5.Р”Р„ll other dialog options in the Wizard can be left at the default. We will specify the stationary components later in the analysis setup. Since we have set a global rotation, all components are considered rotating with the specified angular velocity. We set the angular velocity to 2,000 rpm (209.5 radians/second) about the Z-axis. We activate the Rotation feature and select РІР‚СљGlobal rotatingРІР‚Сњ from the dropdown. For this example, we will perform the analysis using SI units.Р”Р‡igure 4 is the first dialog box that allows us to indicate that some of the components in the solid model will be rotating during operation. The next dialog box is for specifying units. Here we name the project and add any comments. The Wizard starts with the dialog box in Figure 3. As with many Flow Simulation problems, the Wizard option gives a good starting point for setting all the major options. The operating parameters we will simulate are as follows:Р”Р„ SOLIDWORKS solid model representation of the pump internals is shown in Figure 2 below.Р”Р„ key parameter in simulating turbomachinery is identifying the rotating components in the model and using boundary conditions to specify stationary components. Pumps and most turbomachinery operate by converting power in the form of an electric motor (P 2 in the diagram below) to fluid power in the form of pressure and flow. The motor rotates the impeller at high speed, creating a vacuum to generate suction at the inlet. This article looks at applying these concepts to a pump design.Р”В¬onsider the pump shown in Figure 1. This involves specifying rotation of the fluid and solid bodies within the computational domain. However, there is another feature of the Flow Simulation toolset that can assist in evaluating fluids interacting with mechanisms in motion, useful for assessing the design and performance of turbomachinery.

#Solidworks flow simulation negative pressure warning software

While the software is capable of analyzing a variety of solid bodies and fluid configurations, the solutions are typically characterized by flow in or around stationary solid bodies. SOLIDWORKS Flow Simulation can evaluate the fluid flow for various engineering applications and can facilitate thermal analysis for solving various heat transfer problems.