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# The Design – CFD Compressible Flow Model of Air Ejection from Pressurized Tank | ANSYS Fluent

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This simulation is about a CFD Compressible Flow Model of Air Ejection from a Pressurized Tank via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

A simple control system for a water well

Referring to the figure above, a submersible water pump is installed in a well. The pressure switch turns the water pump on when it senses a pressure that is less than Plo and turns it off when it senses a pressure greater than Phi. While the pump is on, the pressure tank fills up. The pressure tank is then depleted as it supplies water in the specified pressure range to prevent “short-cycling”, in which the pump tries to establish the proper pressure by rapidly cycling between Plo and Phi.

A simple pressure tank would be just a tank that held water with an air space above the water which would compress as more water entered the tank. Modern systems isolate the water from the pressurized air using a flexible rubber or plastic diaphragm or bladder because otherwise the air will dissolve in the water and be removed from the tank by usage. Eventually, there will be little or no air and the tank will become “waterlogged” causing short-cycling and will need to be drained to restore operation. The diaphragm or bladder may exert pressure on the water, but it is usually small and will be neglected in the following discussion.

Case 1 is an empty tank at the charging pressure Pc (gauge). The total volume of the tank is Vt. Case 2 is a tank in use, with the air pressure at pressure P (gauge) and a water volume of V

Referring to the diagram on the right, a pressure tank is generally pressurized when empty with a “charging pressure” Pc, which is usually about 2 psi below the turn-on pressure Plo (Case 1). The total volume of the tank is Vt. When in use, the air in the tank will be compressed to pressure P and there will be a volume V of water in the tank (Case 2). In the following development, all pressures are gauge pressures, which are the pressures above atmospheric pressure (Pa, which is altitude-dependent). The ideal gas law may be written for both cases, and the amount of air in each case is equal:

This analysis has tried to simulate and analyze the modeling of a CFD Compressible Flow Model of Air Ejection from a Pressurized Tank using ANSYS Fluent software.

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### The Design – CFD Compressible Flow Model of Air Ejection from Pressurized Tank | ANSYS Fluent

This simulation is about a CFD Compressible Flow Model of Air Ejection from a Pressurized Tank via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

A simple control system for a water well

Referring to the figure above, a submersible water pump is installed in a well. The pressure switch turns the water pump on when it senses a pressure that is less than Plo and turns it off when it senses a pressure greater than Phi. While the pump is on, the pressure tank fills up. The pressure tank is then depleted as it supplies water in the specified pressure range to prevent “short-cycling”, in which the pump tries to establish the proper pressure by rapidly cycling between Plo and Phi.

A simple pressure tank would be just a tank that held water with an air space above the water which would compress as more water entered the tank. Modern systems isolate the water from the pressurized air using a flexible rubber or plastic diaphragm or bladder because otherwise the air will dissolve in the water and be removed from the tank by usage. Eventually, there will be little or no air and the tank will become “waterlogged” causing short-cycling and will need to be drained to restore operation. The diaphragm or bladder may exert pressure on the water, but it is usually small and will be neglected in the following discussion.

Case 1 is an empty tank at the charging pressure Pc (gauge). The total volume of the tank is Vt. Case 2 is a tank in use, with the air pressure at pressure P (gauge) and a water volume of V

Referring to the diagram on the right, a pressure tank is generally pressurized when empty with a “charging pressure” Pc, which is usually about 2 psi below the turn-on pressure Plo (Case 1). The total volume of the tank is Vt. When in use, the air in the tank will be compressed to pressure P and there will be a volume V of water in the tank (Case 2). In the following development, all pressures are gauge pressures, which are the pressures above atmospheric pressure (Pa, which is altitude-dependent). The ideal gas law may be written for both cases, and the amount of air in each case is equal:

This analysis has tried to simulate and analyze the modeling of a CFD Compressible Flow Model of Air Ejection from a Pressurized Tank using ANSYS Fluent software.

### Geometry & Grid

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 1,0134e+006 mm².

### Model

K-epsilon (2 equation) model has been used for fluid flow inside the design modeler and the simulation considers air phenomena. So, Case will be initialized with mixed pressure are solved.

### Boundary Condition

The momentum input for this geometry is considered a Stationary Wall in Wall Motion, at the heat transfer coefficient of thermal conditions is 45 [W/(m^2*K)]. The momentum of the shear condition is also considered as No Slip. The motion of the design modeler is defined as Relative to Adjacent Cell Zone for the circular outer domain boundary condition.

### Discretization of Equations

According to the type of flow, the implicit is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Second Order Upwind.

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