Ansys workbench 2d axisymmetric tutorial

ansys workbench 2d axisymmetric tutorial

Ansys Fluent Tutorial 1. Compressible Flow in a Nozzle We are ready to do a simulation in ANSYS Workbench! Open ANSYS The 2D axisymmetric. ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS and any Hexa Mesh Generation for a 2D Pipe Junction. 1. Introduction · 2. Truss Examples · 3. Plane Stress Examples · 4. Axisymmetric Problems · 5. Three Dimensional Models · 6. Heat Conduction & Axisymmetric Thermal. FORTINET MALAYSIA JOB

September 2, , Re: How to use axisymmetric model? Fluent will use the x-axis as the axis of rotation. Any portions of cells falling below the x-axis will result in negative volumes. July 30, , August 1, , Axisymmetric model is used when the geometry is axisymmetric for example, flow through a pipe, where you can model just a 2D half-section of the pipe.

Here, there is no flow in the z-axis. In axisymmetric swirl, there is swirling flow in the z-axis normal to the geometry plane. In your case, you can model it like a stirred tank, by giving a rotational velocity to the walls. August 2, , Thank you for your reply I am trying to model a flow on a rotating disk,so I have a velocity component normal to the plane,you mean that I should use axisymmetric swirl model? Last edited by soroush; August 5, at June 4, , Reference values for axisymmetric model.

Sabarish Narayan. Hi I am modelling flow past a bullet which is an axisymmetric model. But the Cd value i am getting does not match with the experimental values. July 7, , Join Date: May Hello, Jeffery I also have the same problem with you mesh cheking problem for axisymmetric model.

I think you should translate the mesh so that all the nodes are above the rotational axis, here the x-axis. Otherwise, there can be some calculation mistakes. Translating the mesh. Best regards. July 8, , 2D axisymmetric. Join Date: Jul Hi, I would like to ask if it is possible to view the results of a simulation using a 2D axisymmetric model in 3D?

July 9, , Originally Posted by ShimiSan. July 11, , Thank you huanxiongkuai. Thank you huanxiongkuai I don not think so. The axisymmetric model is only available in 2d simulations. BB code is On. Smilies are On. Trackbacks are Off. Pingbacks are On. Refbacks are On. Forum Rules. All times are GMT The time now is Add Thread to del. Recent Entries.

Best Entries. Best Blogs. Search Blogs. How to use axisymmetric model? User Name. Remember Me. Members List. Mark Forums Read. Page 1 of 2. Thread Tools. August 29, , August 30, , Select F. Task 1. Create a sub-task for the isothermal flow. Create a sub-task a. Select Generalized Newtonian isothermal flow problem. A small panel appears asking for the title of the problem. Enter die swell as the New value and click OK. The Domain of the sub-task menu item appears in bold text.

Note At this point when Domain of the sub-task appears in bold text if you realize that you have made a mistake in the creation of the sub-task and you need to return to that menu, do the following: i. Click Upper level menu. Select Redefine global parameters of a sub-task and make the necessary changes.

Step 3: Material Data iv. Select die swell at the bottom of the existing menu. Define the domain where the sub-task applies. Since this flow involves a free surface, the domain is divided into two subdomains: one for the region near the free surface and the other for the rest of the domain. Here, the sub-task applies to both subdomains the default condition.

Domain of the sub-task Accept the default selection of both subdomains by clicking Upper level menu. The Material data menu item appears in bold text. Step 3: Material Data Polydata indicates the material properties that are relevant for your sub-task by dimming the irrelevant properties.

In this case, viscosity, density, inertia terms, and gravity are available for specification. For this model, define only the viscosity of the material. Inertia effects are neglected and density is specified only when inertia, gravity, heat convection, or natural convection is taken into account. Since gravitational effects are not included in the model, the default value of zero is retained for gravity. Material data Release Click Shear-rate dependence of viscosity. Click Cross law. Specify the value for.

Modify fac Enter as the New value and click OK. Modify tnat 10 Release Step 4: Boundary Conditions Enter 0. Specify the value form. Modify expom Enter 0. Check whether the values of the constants are correct, and repeat the previous steps if you need to modify the constants again. Click Upper level menu three times to leave the Material Data specification. The Flow boundary conditions menu item appears in bold text. Step 4: Boundary Conditions In this step, set the conditions at each of the boundaries of the domain.

When a boundary set is selected, its location appears in bold text in red in the graphics window. Flow boundary conditions Release Click Inflow. Click Modify volumetric flow rate. Polydata prompts you for the volumetric flow rate. Enter 10 as the New value and click OK. Select Automatic and click Upper level menu. When the Automatic option is selected, Polydata chooses the most appropriate method to compute the inflow.

In this case, Polydata will use a 1D finite-element technique to compute a 1D fully-developed velocity profile, based on the specified material properties and flow rate. Moreover, the inflow 12 Release Step 4: Boundary Conditions boundary condition requires that the computational domain be built in such a way that the basic assumptions of fully-developed flow are satisfied.

In axisymmetric geometries, the inflow section must be perpendicular to the axial direction. The fluid is assumed to stick to the wall, since at a solid-liquid interface the velocity of the liquid is that of the solid surface. This is commonly known as the no-slip assumption because the liquid is assumed to adhere to the wall, and therefore has no velocity relative to the wall.

In a steady-state problem, the velocity field must be tangential to a free surface, since no fluid particles go out of the domain through the free surface. Click Free surface. Click Boundary conditions on the moving surface. Note Do not select the Outlet option. It is only applicable for die design problems. Click Position imposed. Click Upper level menu to return to the Kinematic condition menu. Retain the default settings for the Normal force and Direction of motion.

Click Upwinding in the kinematic equation. Click Upper level menu to return to the Flow boundary conditions menu. It is reasonable to consider that a uniform velocity profile is obtained at the exit. In most cases, a bulk flow is obtained and thus no force is acting, so the selection of zero normal and tangential forces is appropriate. In situations involving pulling velocity or force or gravity, the corresponding boundary condition should be selected.

Click Normal and tangential forces imposed fn, fs. Accept the default value of 0 for the normal force d. Accept the default value of 0 for the tangential force by clicking Upper level menu. Click No when prompted to confirm that the rotational velocity is 0.

The rotational force is 0, not the rotational velocity. Click 'w' force imposed. Accept the default value of 0 by clicking OK. Click Yes to confirm that the rotational force is 0. For axisymmetric models, the axis of symmetry is always the y axis. In the equation for , X denotes the direction and Y denotes the direction. Click Normal and tangential velocities imposed vn,vs.

Accept the default value of 0 for the normal velocity and tangential velocity by selecting Upper level menu twice. Accept the default value of 0 for the constant A by clicking OK. Enter 6. Accept the default value of 0 for the constant C by clicking OK.

Click Yes to confirm the "w" velocity equation. Click Upper level menu at the top of the Flow boundary conditions menu. The Global remeshing menu item appears in bold text. Step 5: Remeshing This model involves a free surface for which the position is unknown. Hence a remeshing technique is applied on this part of the mesh.

The free surface is entirely contained within subdomain 2, and hence only subdomain 2 will be affected by the relocation of the free surface. Global remeshing 1. In some cases, when the mesh is geometrically complex, it may be necessary to split it into additional subdomains in order to define a specific remeshing method on each of them.

For this purpose, Polydata allows you to create several local remeshings. For the current problem, a single local remeshing is sufficient. Step 5: Remeshing a. If you accidentally remove the wrong subdomain, select it and click Add to restore it. Then, follow the instructions to remove the correct subdomain.

The Method of Spines menu item appears in bold text. Define the parameters for the system of spines. The purpose of the remeshing technique is to relocate internal nodes according to the displacement of boundary nodes due to the motion of the free surface.

Mesh nodes are organized along lines of remeshing spines , which are collections of nodes logically arranged in a one-dimensional manner. This technique is most suited for 2D extrusion problems. Polydata requires the specification of the first and last spines that the fluid encounters inlet of spines and outlet of spines, respectively.

In this case, the inlet of spines is the intersection of subdomain 2 with subdomain 1, and the outlet of spines is the intersection of subdomain 2 with the flow exit boundary 4. Method of Spines a. Specify the inlet for the system of spines.

Step 6: Stream Function b. Specify the outlet for the system of spines. Click Upper level menu twice. At this point, if you realize that you have made a mistake in global remeshing, click die swell at the bottom of the menu and perform this Step again. Step 6: Stream Function Once the velocity field is known, Polyflow calculates the stream function automatically.

This calculation requires you to specify the point where the stream function vanishes. Polydata imposes a vanishing value at the nodal point closest to the specified position. Assign the stream function 1. Select Condition on the stream function for field 1. Click No in the window that pops up. Enter 5 as the New value of X.

Retain the default value of 0 for Y. If you have made a mistake in assigning the stream function, click F. Task 1 to get into that menu and then repeat this Step. Step 8: Save the Data and Exit Polydata 1. Step 7: Outputs After Polyflow calculates a solution, it can save the results in several different formats.

Choose the format that is appropriate for your postprocessor. Outputs 1. Select Listing: max. When exiting the menu, Polydata asks you to confirm the current system units and fields that are to be saved to the results file for postprocessing. Specify the system of units for the simulation. Click Modify system of units. If you do not enter the menu Outputs, Polydata will ask you to confirm the current system units at the end of the session, if it is a new session.

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