Challenge on Gearbox Sloshing effect

Part 1:

1. 20% Immersion, Fluid - Engine oil.
2. 30% Immersion, Fluid- Engine oil.
3. 20% Immersion,Fluid-n-heptane (c7h16).
4. 30% Immersion,Fluid-n-heptane (c7h16).

Module:-

2D Gear :-

Mesh :-

UDF

Procedure & setup :-

1. First of all you have to create baseline mesh for 1mm,
2. After that you have to use trianglur mesh size pattern.
3. You have to select the left gear and right gear by using edge selection tool and named the selection.
4. Close the mesh page and open the fluent page
5. setup

transient state

gravity = -9.81

multiphase on for 2 region one is engine oil or n-heptane and another one is air,

use fx equation for rate.c file has been compiled.

Hybrid intialization

patch the contour graph with engine oil or n-hetane oil

num of time steps 5e-5

num iteration for case1 and case 2 are 2000

num iteration for case3 and case 4 are 1600

Case 1 :- 20% Immersion, Fluid - Engine oil.

Scaled Residuals :

flow time 0.0999

Contour :

video file:

Case 2 :- 30% Immersion, Fluid - Engine oil.

Scaled Residuals :

flow time 0.09999999

contour :

video file :

Case 3 :- 20% Immersion,Fluid-n-heptane (c7h16).

Scaled Residuals :

flow time - 0.079999999999999

contour :

video file :

Case 4 :- 30% Immersion,Fluid-n-heptane (c7h16).

Scaled Residuals :

flow time - 0.079999999999999

contour :

video file :

Part 2 :-

1. What is Dynamic meshing? Give some other examples where dynamic meshing can be used.

Dynamic mesh :

The dynamic mesh model allows you to move the boundaries of a cell zone relative to other boundaries of the zone, and to adjust the mesh accordingly. The boundaries can move rigidly with respect to each other (that is, linear or rotational motion), and/or deform.

The motion of the boundaries can be rigid, such as pistons moving inside an engine cylinder or a flap deflecting on an aircraft wing, or deforming, such as the elastic wall of a balloon during inflation or a flexible artery wall responding to the pressure pulse from the heart. In either case, the nodes that define the cells in the domain must be updated as a function of time, and hence the dynamic mesh solutions are inherently unsteady.

Examples :

Examples for sliding mesh are Rotation of gear pair inside a gear casing, Water wheel and dropping of a ball into a water container case.

2.What is the fluid Sloshing effect? Discuss whether the sloshing effect is good or bad? Explain.

In fluid dynamics, slosh refers to the movement of liquid inside another object (which is, typically, also undergoing motion).However, it has become common to refer to liquid motion in a completely filled tank, i.e. without a free surface, as "fuel slosh".

slosh effect is bad

3.What is the use of UDF?

• the users can define own functions to meet certain client requirements. These are known as UDFs in Hive. User Defined Functions written in java for specific modules.
• Some of UDFs are specifically designed for the reusability of code in application frameworks. The developer will develop these functions in Java and integrate those UDFs with the Hive.
• During the Query execution, the developer can directly use the code, and UDFs will return outputs according to the user defined tasks. It will provide high performance in terms of coding and execution.
• For example, for string stemming we don't have any predefined function in Hive, for this we can write stem UDF in Java. Wherever we require Stem functionality, we can directly call this Stem UDF in Hive.
• Here stem functionality means deriving words from its root words. It is like stemming algorithm reduces the words "wishing", "wished", and "wishes" to the root word "wish." For performing this type functionality, we can write UDF in java and integrate with Hive.
• Depending on the use cases the UDFs can be written, it will accept and produce different numbers of input and output values.
• The general type of UDF will accept single input value and produce a single output value. If the UDF used in the query, then UDF will be called once for each row in the result data set.
• In the other way, it can accept a group of values as input and return single output value as well.

4.Discuss the common errors that occurred in the simulation.

i get 'Dynamic mesh failed' error.