Questions tagged [simulation]

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2 votes
1 answer
281 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....
0 votes
1 answer
50 views

Modeling the Internal Forces Exerted on a Catapult Arm while Throwing

I am currently creating a MATLAB script to determine the internal forces present in a uniform beam as it is accelerated by a torsional spring. I was able to derive the equation for the axial force ...
0 votes
0 answers
31 views

What tool (numerical/simulation) can help me with this problem on liquid/gaseous nitrogen in a cylinder?

I hope everyone's doing well. I was wondering what kind of tools (numerical/simulation, and perhaps the corresponding equations as well) can help me model this problem of liquid/gaseous nitrogen in a ...
1 vote
1 answer
42 views

Are there any advantages of using BEM for contact problem over FEM, apart from lesser computational cost?

FEM - Finite Element Method BEM - Boundary Element Method If we had access to "enough" computational resources (to discretize the entire volume domain in FEM to the same degree of fineness, ...
0 votes
1 answer
245 views

Pspice ac sweep problem

I want to run an AC sweep from 1 Hz - 10 MHz and calculate the output of the circuit (the voltage on RL), however spice shows that my voltage is 0 in a lot of parts that it shouldn't. I believe the ...
0 votes
0 answers
25 views

What is the difference between activity and event in "simulation"?

I am studying about components of a system. The subject is "system simulation/simulation modeling/discrete event system simulation". This is related to electrical, electronics, computer ...
1 vote
1 answer
74 views

Finite difference discretization of the Cauchy-Riemann PDEs

I made a forward fd-discretization of the Cauchy-Riemann PDEs but I am struggling to implement this in python. I have a quadratic mesh with heighτ = $2*\pi$. The dirichlet boundary conditions are at $...
0 votes
1 answer
124 views

VPython Simulation of Coupled Oscillators Not Displaying Normal Modes Properly

The VPython code found at the following link https://glowscript.org/#/user/cody825/folder/Lab8/program/CoupledMassSpringSystemCopy/edit Aims to simulate a 6-mass, 7-spring coupled oscillator system. ...
1 vote
1 answer
48 views

CFD simulation of an Air and Oxygen gas gradient in a microfluidics device

I am in the process of manufacturing a microfluidic device for use in research, and would like to do a CFD simulation of the interior of the device to see if an oxygen gradient is formed. The idea is ...
0 votes
0 answers
66 views

How to calculate scaled speed

While working on a project I faced a difficult problem. Let's say I have car at a 1/10 scale. Now if a real car drives at 10 m/s, it would take 3 seconds to travel 30m. If we look at the scaled car ...
1 vote
1 answer
332 views

How to calculate initial concentration of first-order reaction in CSTR?

(This question comes from a Chemical Engineering background, but basic Math and Programming knowledge is also required. I hope it still falls in the scope of engineering.stackexchange.com If not, ...
3 votes
3 answers
337 views

Non-Linear Analysis Convergence Problem in Ansys

I am currently conducting a static structural analysis study in Ansys and encountered convergence prolems. I have a very large thermal gradient (almost 600°C) as input from a precedent transient ...
0 votes
1 answer
37 views

How to determine time taken for tyre to deflate using CFD analysis?

I am working on my final year project, and am at a point which requires us to deflate a tyre in 0.8 seconds. This needs to be simulated using CFD. We have drilled a hole into the rim and attached a ...
1 vote
1 answer
100 views

How to repeat on ABAQUS FEM simulations without reloading the mesh?

I would like to perform several FEM simulations on a given mesh with ABAQUS, where only the orientation of an element set would change in between. Currently, I'm just generating several inp files (...
0 votes
1 answer
354 views

Custom User Models in Aspen Plus

I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...
0 votes
0 answers
28 views

Working of gearbox in driving simulators

I am a newbie in this field. Please help me in gaining a bit initial fundamental knowledge in simple language. How are gearbox ratios interpreted in driving simulators? Are the gearboxes used in ...
0 votes
2 answers
71 views

Modeling a second order system in time and frequency domain

For school I was asked to model the transfer function $H(s)=\frac{3}{(s+4)(s+5)}$ in both the time and frequency domains using initial conditions $y(0)=2,y'(0)=3$, a step input, and Simulink. I would ...
0 votes
0 answers
20 views

Simple simulation model of water boiling in a pot?

I want to investigate boiling processes (in the kitchen) by simulation. To this end I assume there is a pot ($m_\mathrm{pot}, C_\mathrm{pot}, T_\mathrm{pot}$) with some water inside ($m_\mathrm{water},...
0 votes
0 answers
29 views

I'm trying to understand an equation from a motor simulation $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$

I have a simulated motor and I'm not understanding the math to control it. This is the equation for the force of the motor, also called an 'actuator'. $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$ w ...
0 votes
0 answers
23 views

How do I find the tracking error when simulating spacecraft motion?

I have been studying Control of Nonlinear Spacecraft Attitude Motion and I would like to solve the following question. I have created the following MATLAB code that works for similar questions, but ...
0 votes
1 answer
66 views

What is meant by Solid Mesh and Surface Mesh? [closed]

Solid Mesh vs Surface Mesh, which method should I choose in simulation studies. What is the geometry behind these meshes. Which mesh gives accurate results?
1 vote
1 answer
130 views

simulation of an attitude optimal Backstepping controller based quaternion for a UAV in MATLAB

I'am trying to implement this open access research article Attitude Optimal Backstepping Controller Based Quaternion for a UAV I did not find the same result in this paper Can anyone tell me where my ...
0 votes
0 answers
33 views

Isn't the Newton's cooling law for heat convection too macroscopic for CFD simulations?

In CFD (Computational Fluid Dynamics) simulations, the space is discretised into a huge number of tiny cells and, therefore, one has the opportunity to use a model of heat transfer that takes into ...
0 votes
1 answer
24 views

Stress/impact simulation of a solidworks design

I am creating a waterproof box that will be submerged under a few feet of soil and also must be able to withstand the impact if dropped from a height. I am wondering if it is possible on solidworks, ...
0 votes
0 answers
53 views

How to determine pump input/output pressure?

I wanna create iterative simulation of some fluids system. In this system i have multiple connected objects. For each object i calculate input and output pressure and then calculate transfered amount ...
0 votes
1 answer
48 views

G code simulation in NC Viewer for Manufacturing Engineering

I am trying to simulate the following code in NC Viewer (https://ncviewer.com/). O001 N10 G20 G90 N20 M06 T1 N30 M03 S500 N40 M08 N50 G01 X0.25 Y0.25 Z0.25 N60 G00 Z-0.25 F2 N70 G01 X0.4 Y1.75 N80 ...
0 votes
0 answers
84 views

How to simulate gas-liquid mixing in a bioreactor in ANSYS Fluent?

I thank you for taking a look. I'm a beginner with so much love to simulate fluids as fluid visualizations fascinate me. My learning has been only through youtube, forums. So, please excuse my naivety ...
0 votes
1 answer
54 views

Mesh part failed in solidworks issue

This assembly is extremely hard to mesh. Even, if I used an extremely finer mesh and took a long time to solve, it still keep failing. This model can be found at https://drive.google.com/file/d/...
1 vote
1 answer
58 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
0 answers
86 views

How to export 'simplified' geometry from Simulation workspace in Fusion 360 to ANSYS Mechanical?

I would like to export the defeatured version of my design to ANSYS. I tried adopting the following methods but they weren't working out. (https://forums.autodesk.com/t5/fusion-360-design-validate/...
1 vote
0 answers
28 views

Solidworks flow simulation temperature drop

Using Soldiworks flow simulation, I want to calculate the temperature drop of water (40 degrees) which flows in 10 m steel pipe. How should I manage Wizards setting and goal?
0 votes
1 answer
116 views

Modeling torque as surface pressure

Consider a rod with a length of 150 [mm] and a diameter of 44 [mm]. At the left boundary the rod is fixed to a wall. At the right end a torque of 1000 [N m] is applied. The remaining boundaries are ...
1 vote
1 answer
64 views

Ripple tank simulation for simulating light waves? [closed]

Can anyone help shedding some light on how ripple tanks are programmed? example I'm looking to simulate light waves, to perform theoretical calculations, as opposed to for just visual effect. The ones ...
0 votes
0 answers
20 views

Is there any cost effective static stress simulation for rapid prototyping (FDM / 3D-printing)?

I've been using the static stress simulation (computed locally) which, until recently, has been free with the Personal licence of Fusion 360. Is there a reasonable alternative? The cost that Autodesk ...
0 votes
1 answer
27 views

Can FSI analysis be linear on the solid part? [closed]

Is the FSI analysis always considered Nonlinear or the solid part analysis can be linear too?
0 votes
0 answers
61 views

Large scale nonsymmetric standard and generalized eigenvalue problems in engineering

I apologize if this is not the right forum for my question, but I cannot think of better place to reach a large number of engineers within a short time span. Question: I am a mathematician working in ...
2 votes
0 answers
29 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 ...
0 votes
1 answer
49 views

What meaning does the following sine wave have when it comes to amplitude?

So I am getting into engineering and was curious what it means when a sine wave isn't even in a sense, at 0, from my understanding, the waveform has peak to peak amplitude of 4, while having a ...
-1 votes
1 answer
24 views

Comments on Patankar's book Numerical heat transfer and fluid flow

How to make comments on the book of Patankar, titled 'f' in 1980? Is it really worthy for beginners in the field of numerical heat transfer to read it? Besides, after finishing reading this book, what ...
2 votes
0 answers
64 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 ...
0 votes
1 answer
667 views

Simulation of RC circuit using Proteus

I am learning how to use Proteus and I have come across the charging and discharging of a capacitor problem. My main problem is on how to use the graph feature of Proteus to simulate how the voltage ...
0 votes
1 answer
93 views

MSC Adams: “angular kinetic energy” vs “angular momentum about a center of mass”: which is the most relevant measure of the flywheel's storage?

MSC Adams produces several different measures of a rotating body. In a flywheel, what is the difference between 'angular kinetic energy' (in newton-mm) vs 'angular momentum about the center of mass' (...
3 votes
0 answers
39 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 ...
2 votes
1 answer
29 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 ...
1 vote
0 answers
17 views

Finite element welding simulation with commercial software? [closed]

I am looking forward some libraries/add-ons to perform welding simulation (thermomechanical coupling, steel alloys) using commercial software, like Ansys or Abaqus. My aim is to determine better ...
0 votes
0 answers
63 views

Import Coordinate System as Marker in MSC Adams

A very simple question, yet I couldn't find an answer: I created a simple part (e.g. in SolidWorks) with one solid body and two Coordinate Systems. I would like to place my Joints, Revolutes, etc. in ...
1 vote
1 answer
140 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 ...
0 votes
0 answers
22 views

Why is CGNS not used in CSM?

The CGNS format appears to be only applied in CFD (computational fluid dynamics). Why is it not applied in CSM (computational solid mechanics)? Is there any technical reason? The hierarchical ...
-1 votes
1 answer
322 views

Velocity inlet boundary condition in Ansys Fluent

Ansys Fluent offers a very simplified version of boundary conditions. So if I know the velocity at the inlet, I need not care about pressure and vice versa. What I am having trouble with is that I ...
1 vote
0 answers
134 views

what is the difference between jblade, qblade, and xflr5 softwares?

I am working on a propeller design, and I've came through Jblade which helped me in the airfoil design, yet as I can remember, xflr5 can also do this... doing some internet search, i found that Jblade ...