# Tag Info

Accepted

### Which turbulence models are suitable for CFD analysis on a streamlined vehicle body?

The turbulence model can make a big difference in your simulation. There are many turbulence models around. It becomes a tough job to select one out of them. There is no perfect turbulence model. It ...
• 1,423
Accepted

### What filter is this?

It might be written that way because the transfer function of a second order system is written as: $$h(s) = \frac{\omega_n^2}{s^2 + 2\zeta \omega_n s + \omega_n^2}$$ where $\zeta$ is the relative ...
Accepted

### What amplitude is used for a finite element modal analysis excitation?

The short answer is, there is no amplitude used. Even more important though, is the fact that the displacements and stresses shown in the results of a modal analysis cannot be used to say anything ...
• 2,809
Accepted

### Where does weight mass conversion ratio '0.00259' come from in Nastran?

It's the inverse of the acceleration of gravity g in imperial units. $$1 g = 386.1 in/s^2$$ $$1/g = 0.00259 s^2/in$$ You need that since: $$weight = mass * g$$
• 176

### What amplitude is used for a finite element modal analysis excitation?

The amplitudes of the modes from a vibration analysis are arbitrary. Often they are "mass-normalized" which is mathematically convenient for using them in a subsequent step in the analysis. There may ...
• 12.6k

### How to convert Joules(kinetic energy) plot chart into watts?

To convert a plot of J versus s to a plot of J/s vs s, take the derivative. Here is my quick-and-dirty answer after digitizing the data.
• 2,905
Accepted

### How to simulate the contact between two distant parts in Ansys workbench？

Okay so I ended up having a play in ANSYS Mechanical Workbench. I did a mock up of your problem. Here's how I've been able to successfully model it. Note that a lot of my decisions are based on the ...
• 1,217

### Is there any aspect of an Explosion resulting from a nuclear weapon test that cannot be simulated using super computers?

The type of machine that runs the simulation (e.g. super computer, slide rule, pen and paper, etc.) is less important than the physical and mathematical models that describe the process being ...
• 3,044

### How much force can a pole in ground take before falling?

this is a typical engineering problem and has an equation approved by IBC numbered 18-1. $$d = 0.5 A{1 + [1 + (4.36h/A)]1/2}$$ The calculation process is I first calculate A =2.3* post load/(allowed ...
• 21.6k
Accepted

### Non-Clutch Vehicle Drivetrain - How Does it Work?

Conventional automatic transmissions have a torque converter which uses a viscous rather than a rigid coupling to connect input and output. This performs a similar function to a friction clutch but ...
• 15.1k

### Is there any aspect of an Explosion resulting from a nuclear weapon test that cannot be simulated using super computers?

The accuracy of a simulation depends more on how well your equations and assumptions model reality, than the resolution of the simulation (computing power, as Carlton has stated). More computing power ...
• 7,629

### How do I model a longitudinal tensile strain in a laminate composite using Abaqus software?

Without knowing more about your problem the first thing that you need to do is make sure that you are using the right geometry and elements. To use that representation you need to use: 2D geometry ...
Accepted

### ANSYS Workbench/Mechanical: Automatically export chart?

There are several options for doing this: If there are only a few values to be saved per design point, you could use 'output parameters'. If there is a lot of data to be saved, the report generator ...
• 156