Questions tagged [simulation]

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12
votes
3answers
5k views

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

Many commercial and open-source CFD codes implement several closure methods for the non-linear convective acceleration term of the Reynolds-averaged Navier-Stokes (RANS) equations. Common methods (...
8
votes
0answers
6k views

Residuals of continuity not converging

I'm simulating a turbine. The convergence of solution is monitored by checking the residuals of the numerically solved governing equations. The "viscous-spalarat-almaras" model is used, and used air ...
7
votes
2answers
1k views

How can I model or simulate motion caused by an internal vibrating motor?

I have a vibration motor contained in an object. The motor looks similar to this: When the motor is running, I want to simulate the movement of the container object that results from the vibration of ...
6
votes
1answer
190 views

Programmable parameter change of Pro/E simulation by using Excel VBA , Matlab, Labview or Pro/E own function

Now, I've been conducting beam simulation by using Pro/E. I would like to change payload(force) of beam step by step, and then plot the relation between deflection and payload(load range : 50kg to ...
5
votes
2answers
4k views

ANSYS Workbench/Mechanical: Automatically export chart?

I'm running a simple tensile test simulation for a single element. Under Results I made a Chart object with Stress vs Strain, which can be manually exported to a csv file by right clicking on the ...
5
votes
1answer
146 views

How do I model a longitudinal tensile strain in a laminate composite using Abaqus software? [closed]

I want to be able to measure the strain response in a material composed of 2 lamina, bottom one (0) top one half (0) half (90), and see the differences in the unidirectional versus the bidirectional ...
5
votes
0answers
276 views

Explicit Dynamic ANSYS - Origami structure

I am working on a flat-foldable conical structure and I would like to carry out some dynamic tests on it (deployment to get the displacements and accelerations...). I have designed the folded ...
4
votes
2answers
2k views

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

In a typical finite elements analysis package, a modal analysis gives the N first natural modes, and it is possible to get the equivalent stress and total deformations for each of these frequencies. ...
4
votes
1answer
406 views

Different calculations for values of thermodynamic properties

While deciding what tool (library) to use for a simulation of a hybrid gas turbine plant, I found that different libraries/tools of thermodynamic properties yield different values than the other. I ...
4
votes
0answers
145 views

How to compare small and large scale model of an IC engine to predict force, torque, rpm etc generated by actual engine?

I have this 6 cylinder radial engine designed in Solidworks. Rendering Blueprint (Source:Inventor Wizards) And I want to perform some motion analysis on this engine to make some prediction about it'...
3
votes
2answers
10k views

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

I made a test in Ansys but the result doesn't seem to be the final steady state. The two bodies didn't touch each other. How can I get the right result?
3
votes
1answer
187 views

Automotive Radiator Simulation

I'm developing a code to simulate thermal performance of automotive radiators. My results are 40% under-predicted. But when I multiply them to 1.6, they match completely. This is the graph that ...
3
votes
1answer
2k views

SolidWorks circuit simulation?

I use Labcenter Proteus Circuit simulation - you create circuit design, then apply current and see simulation in action - for example leds are blinking, or motor is rotating. If there is ...
3
votes
1answer
128 views

How can I limit a simulated aircraft's angle of attack?

I am making an aircraft in a simulator (using JSBSIM). Note that I am not a professional. The manual states that it is limited below certain calibrated airspeed to a certain positive angle of attack. ...
3
votes
0answers
36 views

I don't understand a simulation result of frequency vibration analysis of ultrasonic tranducer

I am building a ultrasonic transducer like this (with double-exponential (75%-25%) match and 2 ring PZT8 50x20x6.5 (for the moment I do not take account of pre-stress on bolt) : When I simulate the 2 ...
3
votes
0answers
28 views

How to measure / calculate Tait-Bryan angles of a moving platform in SimMechanics

I exported a model of the mechanism created in SolidWorks to SimMechanics in order to explore the possibilities of control. To solve the problem, i need to know the angular position of the mobile ...
3
votes
0answers
250 views

Single-phase fully-controlled thyristor converter simulation using simulink

I am trying to implement a simple single-phase fully-controlled thyristor converter using Simulink. As load I have placed just an inductor, the firing angle is set to a=60 deg., f=50 Hz and the rms ...
3
votes
0answers
131 views

Generating a IES file from an illuminaire and a lens

I have a IES luminaire file of a lamp and some polar candela distribution plots of lenses like: How can I create a new luminaire file combining the lamp with every lens? I could manually sample the ...
2
votes
1answer
86 views

What filter is this?

I am implementing a second order filter. It simulates hydraulic servo on an airplane. Its about 35-40 years old. What confuses me is the notation. Like "2(.7)(52)S", what does it mean? If its just ...
2
votes
1answer
201 views

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

How to convert Joules(kinetic energy) plot chart into watts? Anyone know how?
2
votes
2answers
174 views

Non-Clutch Vehicle Drivetrain - How Does it Work?

I am making a vehicle simulation, but just noticed a big issue - there are a lot of cars with no clutch in them, but I haven't driven a car with automatic/clutchless-manual gearbox, nor been even a ...
2
votes
1answer
135 views

How should the assignment to test software for a vehicle’s VCU be aproached?

As a graduation project, I was assigned to solve the following problem: How can the vehicle’s behaviour be simulated in the form of a testing programme, with which the VCU software can be fully ...
2
votes
2answers
36 views

Simulate Dust Layer on PV Cell?

Is it possible to simulate a layer of dust deposited on top of a PV cell in a controlled manner? One potential method I had was to put a given weight of a particulate/powder (chalk powder, talcum ...
2
votes
1answer
58 views

What standards exist regarding diagnostic systems in automotive engineering?

I'm designing a diagnostic system that simulates an environment and user input for a dummy vehicle. All possible critical situations are simulated in order to find out whether any errors are triggered,...
2
votes
1answer
140 views

Problems regarding aspen simulation

I am trying to model water gas shift reactor on Aspen using an Rgibbs reactor. Unfortunately whenever i pass the stream into the reactor(HTS) the amount of CO and H2 both are increasing and C in the ...
2
votes
1answer
79 views

Component-based simulation versus block-based simulation

Modelica touts as one of its advantages over Simulink that it is "component-based" whereas Simulink is "block based". What exactly does this mean?
2
votes
1answer
624 views

Simulation of First Order System (Matlab & Simulink)

Yesterday, I tried to find constants $k_1$ and $k_2$ for the following system: $$\frac{\mathrm d RH}{\mathrm dt}=k_1+k_2(RH_{ext}-RH).$$ Now, I have some first computations for $k_1$ and $k_2$ and ...
2
votes
0answers
18 views

How are circular dependencies dealt with inside MBSE?

How are circular dependencies (best) managed inside of MBSE environments? Let's say I have two properties that are linked to each other / they are linked to properties that affect each other. How is ...
2
votes
0answers
34 views

Convergence problem in RANS simulation of unsteady flow

I am simulating an air flow through a two dimensional rectangular channel. The channel splits into two channels, one of them is followed by a 90 degree bend downwards and leads into a cylindrical ...
2
votes
1answer
25 views

differential drive vehicle in screen coords

differential drive vehicle in world frame what would change in the kinematic model of the differential drive vehicle if i wanted to simulate it using pygame module in python ( pygame or opencv or any ...
2
votes
0answers
43 views

Solidworks Simulation- Large displacement with Inertia Relief

I'm trying to use the Solidworks simulation package to solve for the stresses inside a body as it accelerates (very rapidly). Because I expect some small features to deform quite a bit, I need to use ...
2
votes
0answers
62 views

Bolted joint junker test with finite element method

Anybody knows a tutorial to make a finite element analysis for bolted joints like junker test(fastener vibration) in Solidworks or Ansys?
2
votes
0answers
634 views

How to simulate an exhaust fan condition in ANSYS Fluent?

I'm trying to simulate a model which has one inlet and three outlets, and I'm passing air through it. Now, I want one of the outlets to have exhaust fan. I see options of exhaust fan and outlet-vent ...
2
votes
0answers
53 views

Abaqus Milling Simulation

I'm creating a simulation in abaqus of a endmill removing material from and aluminium plate. The simulation is almost working, but only the surface level element are being removed from the plate. The ...
2
votes
1answer
237 views

Physics motion simulator for flying object

I want to see how different combination/position of fan on airplane affect stability of airplane. I need simulator to test one of the idea which involves specific position for propeller on the plane....
2
votes
0answers
31 views

How to calculate the Jacobi of electron/hole continuity equations for semiconductors with respect to potential when applying Newton's method?

These are the discretized drift diffusion equations as taken from the book "Analysis and Simulation of Semiconductor Devices" by Siegfried Selberherr. The electron continuity equation is: $$\begin{...
2
votes
0answers
75 views

Inventor: How to replace static part with articulation?

I have downloaded the following part file of a servo motor as IGES from the vendor: I have then built an assembly that uses several of these motors, as well as a number of idlers/hubs, brackets, ...
2
votes
0answers
1k views

What data do I need to plot a BSFC map

I have an 4 stroke spark ignition engine simulator which takes user inputs and outputs performance data. I need rpm, torque and brake specific fuel consumption (bsfc) to plot the bsfc map. I am able ...
1
vote
2answers
93 views

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

This Washington Post news article states that with the advent of computer simulation of nuclear tests, live tests are no longer needed. Generally speaking there are 3 aspects of an Explosion resulting ...
1
vote
4answers
76 views

Software options for simulating oil flow in small diameter pipes [closed]

I'm looking for 1D software packages that can simulate flows of oil (lubricant) in pipes of a small diameter (typically between 1mm to 12mm in diameter) and have found around 10+ possible candidates, ...
1
vote
1answer
60 views

How to implement a Monte Carlo Simulation for studying uncertainty in dynamic stiffness?

I have a dynamic mechanical system of the form: $$\mathbf{M{\ddot q}+{\Omega_c}G{\dot q}+{Kq}=F(t)}$$ and I need to introduce some uncertainty for the $K$ parameter, which is a symetric matrix of $q$ ...
1
vote
1answer
48 views

Modeling a simple capacitor

Hey guys I am trying to model the performance of a hypothetical capacitor. Capacitance depends on its geometry, but the charging and discharging of the capacitor depend on a resistive load within the ...
1
vote
1answer
94 views

Is a MSC Adams simulation with smaller steps always more reliable?

In a given simulation in MSC Adams, if I use a 1 or 0.1 step increment, I get the (favorable) result I intuitively assumed would occur, but if I use step increments of 0.01 or 0.001 a different (and ...
1
vote
1answer
239 views

LS DYNA Material Model 163, Modified Crushable Foam

Question is on the meaning of input variable TID within material model 163 of LS-Dyna 971. Definition of TID variable. TID: Table ID defining yield stress versus volumetric strain at different ...
1
vote
2answers
356 views

I am trying to create an op amp based negative voltage regulator

I am trying to find simulate an op amp based linear regulator negative voltage regulator circuit. I have done the circuit for positive voltages, but does not know how to do it for negative voltage. ...
1
vote
1answer
60 views

My output is much lower than I expect it to be for my transistor-zener diode voltage regulator

I have created this simulation ( see below) of a transistor and zener diode voltage regulator. The output is supposed to be a steady 5 V. But it is like the top bit s cut, to an approx 4.4 V value, ...
1
vote
1answer
29 views

What is the cycle of simulation editing?

So this is very general, but... How are simulations for vehicles done? I know that computational fluid dynamic simulations are used, but why are repeated tests of actual hardware done too? Obviously ...
1
vote
1answer
55 views

Solidworks Motion capabilities

Is Solidworks Motion capable of finding the torque of the planet carrier (output) in a planetary gear set when in steady state? The sun and ring gears are both inputs and all gears are rotating at a ...
1
vote
2answers
862 views

Can Fortran 90 be used with Aspen Plus, or only Fortran 77?

I am attempting to write a user model in Fortran that can be connected to the Aspen Plus process simulator. Can Fortran 90 be used, or does Aspen only work with the older Fortran 77? I have checked ...
1
vote
1answer
32 views

Suppliers who write dynamical specification inside their data sheet?

I am a beginner in control system for hydraulic servo systems. The reason why I haven't started yet to do simulations of hydraulic servo system is because I have no information about the components I ...