1 / 20

Using FEHT

Using FEHT. Keith A. Woodbury. Introduction. FEHT Is a simple finite element conduction heat transfer analysis program Use of this program entails the same basic steps necessary to solve heat transfer problems with commercial software Is restricted to 2-D problems with less than 1000 nodes

kinsey
Download Presentation

Using FEHT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Using FEHT Keith A. Woodbury

  2. Introduction • FEHT • Is a simple finite element conduction heat transfer analysis program • Use of this program entails the same basic steps necessary to solve heat transfer problems with commercial software • Is restricted to 2-D problems with less than 1000 nodes • Can solve steady or unsteady (transient) problems

  3. Overview • Numerical heat transfer analysis requires the following steps • Define geometry • Define mesh for computation • Assign properties • Define boundary conditions (and initial conditions, if necessary) • Solve for the temperatures • Perform any desired post-processing

  4. Overview (cont) • We’ll illustrate use of the program via an example -

  5. Open FEHT

  6. Define Geometry • First set the grid to something convenient for drawing your 2-D geometry

  7. Define Geometry • Then draw the outline of your object

  8. Define Geometry • “Draw -> Outline…” tips • The crosshair cursor does not snap to the grid • Holding the “shift” key while drawing constrains the motion to straight lines • To make a corner you can click and continue to the next point

  9. Define Mesh • When an outline is complete, the outline blinks, and the “Draw->Element Lines…” option is activated

  10. Define Mesh • “Draw->Element Lines…” tips • Elements must be triangular • Element lines can only connect at nodes (you can’t join an element line to the middle of another element line!)

  11. Define Mesh • Keep going…

  12. Define Mesh • It can be tedious with a lot of nodes

  13. Specify Properties • Click on one of the elements (NOT and edge or node) – the entire outline will begin blinking • Now go to “Specify->Material Properties” on the menu (or right click on the object)

  14. Specify Properties • You can choose from a library of materials or select “not specified” and enter your own data

  15. Apply Boundary Conditions • Either • Use the pointer to drag a box around a region of the boundary, or • Click on a segment of the boundary

  16. Apply Boundary Conditions • The selected portion(s) of the boundary will blink • Choose “Specify->Boundary Conditions” or right click

  17. Specify Boundary Conditions • Fill in the boundary condition information

  18. Apply Boundary Conditions • At any time, “Run->Check” will tell the status of your model • After all boundaries have been assigned conditions, “Run->Calculate”

  19. Solve for Temperatures

  20. Post-Processing • “View->Temperatures” shows the computed nodal temperatures • “View->Temperature Contours” makes a color map of the solution • “View->Temperature Gradients” visualizes the heat flow directions • “View->Tabular Output” gives a table of the solution that can be cut/pasted

More Related