SimScale vs Desktop CAE: Cloud vs On-Premise Simulation Platform Comparison

SimScale vs Desktop CAE: Cloud vs On-Premise Simulation Platform Comparison

I get asked a lot whether cloud simulation tools like SimScale can replace desktop CAE. My answer is always the same: it depends on what you're doing. For a lot of common analyses, SimScale is more than enough. For specialized work — explicit dynamics, electromagnetics, advanced CFD — desktop tools still reign. Let me break down the trade-offs I've experienced using both.

Architecture Comparison

| | SimScale (Cloud) | ANSYS/Abaqus (Desktop) | |---|---|---| | Deployment | Cloud (SaaS) | Local workstation or HPC cluster | | Installation | None (web browser) | Software install + license server | | Hardware | Cloud HPC (up to 96 cores) | User-provided workstation | | Storage | Cloud (included) | Local disk or network storage | | Updates | Automatic (continuous) | Annual release + service packs | | License | Subscription (monthly/annual) | Lease or perpetual + maintenance | | IT overhead | Minimal | Significant (license, HPC, storage) |

Cost Comparison

SimScale Pricing

| Plan | Price | Cores | Mesh Limit | Users | |------|-------|-------|-----------|-------| | Community | Free | 8 | 100K nodes | 1 | | Professional | ~$500/month | 32 | 5M nodes | 1 (+ team add-on) | | Enterprise | Custom | 96 | Unlimited | Unlimited |

Desktop CAE Pricing

| Tool | License Type | Annual Cost | Hardware | |------|-------------|------------|----------| | ANSYS Structural | Lease | ~$20,000/year | $10,000+ workstation | | ANSYS Fluent + Structural | Lease | ~$40,000/year | $15,000+ workstation | | Abaqus Suite | Lease | ~$30,000/year | $10,000+ workstation | | HPC cluster (optional) | Purchase | $50,000+ | - |

Break-Even Analysis

1. Small team (1-3 users):
   • SimScale Professional: $6,000-18,000/year
   • Desktop: $20,000-40,000/year + hardware
   • SimScale is cheaper
2. Medium team (5-10 users):
   • SimScale Enterprise: Custom (~$30,000-50,000/year)
   • Desktop: $100,000-200,000/year (5-10 licenses)
   • SimScale may be cheaper
3. Large team (20+ users):
   • SimScale Enterprise: Custom (~$100,000+/year)
   • Desktop: $400,000+/year (20+ licenses)
   • SimScale may be cheaper, but desktop has more capability

Computing Power

SimScale Cloud

1. Max cores: 96 per simulation (Enterprise)
2. Parallel scaling: Good (up to 96 cores)
3. Memory: Up to 384 GB (cloud)
4. GPU: Not available (CPU only)
5. Queue time: May wait for cloud resources (peak hours)
6. Always latest: No need to upgrade hardware

Desktop CAE

1. Max cores: Limited by workstation (typically 16-64)
2. HPC cluster: Can scale to 1000+ cores (if available)
3. Memory: Limited by workstation (typically 64-256 GB)
4. GPU: Yes (NVIDIA CUDA for acceleration)
5. Queue time: None (dedicated workstation)
6. Hardware refresh: Every 3-5 years ($10,000-20,000)

Performance Comparison

| Simulation | SimScale (32 cores) | Desktop (16 cores) | Desktop HPC (128 cores) | |-----------|--------------------|--------------------|------------------------| | 1M cell CFD | 20 min | 40 min | 5 min | | 5M cell CFD | 1 hour | 3 hours | 15 min | | 10M cell CFD | 3 hours | 8 hours | 30 min | | Nonlinear FEA | 30 min | 60 min | 10 min |

Key difference: SimScale provides more cores than a typical workstation but fewer than a dedicated HPC cluster. For most simulations, SimScale is faster than a standard workstation.

Solver Capabilities

SimScale Solvers

1. Structural: Code_Aster (open-source)
   • Linear static: Yes
   • Nonlinear: Yes (plasticity, contact)
   • Dynamic: Yes (modal, harmonic, transient)
   • Thermal: Yes (steady, transient)
   • Fatigue: Yes
   • Limitations: No explicit dynamics, limited advanced material models
2. CFD: OpenFOAM (open-source)
   • Incompressible: Yes
   • Compressible: Yes
   • Turbulence: k-ε, k-ω, SST, LES
   • Multiphase: VOF
   • Conjugate heat transfer: Yes
   • Limitations: No combustion, limited multiphase compared to Fluent
3. Thermal: Code_Aster + OpenFOAM
   • Conduction: Yes
   • Convection: Yes (coupled with CFD)
   • Radiation: Yes (surface-to-surface)

Desktop CAE Solvers

1. ANSYS: Fluent (CFD), Mechanical (structural), Maxwell (EM)
   • Full capability in each physics
   • Industry-leading CFD (Fluent)
   • Explicit dynamics (LS-DYNA)
   • Advanced material models (250+)
   • Multiphysics coupling (System Coupling)
2. Abaqus: Standard + Explicit
   • Industry-leading nonlinear
   • Explicit dynamics (crash, forming)
   • General contact (auto-detect)
   • User subroutines (UMAT, VUMAT)
   • XFEM for fracture

Capability Gaps

| Feature | SimScale | ANSYS | Abaqus | |---------|---------|-------|--------| | Linear static | Yes | Yes | Yes | | Nonlinear | Yes | Yes | Yes (superior) | | Explicit dynamics | No | Yes (LS-DYNA) | Yes (Abaqus/Explicit) | | CFD (general) | Yes (OpenFOAM) | Yes (Fluent, superior) | Limited | | CFD (combustion) | No | Yes | No | | Electromagnetics | No | Yes (Maxwell, HFSS) | No | | Acoustics | No | Yes | Yes | | Optimization | Basic | Yes (DesignXplorer) | Yes (Tosca) | | User subroutines | No | Yes (Fortran) | Yes (Fortran) | | Material models | 20+ | 250+ | 50+ + UMAT |

Key difference: Desktop CAE (ANSYS, Abaqus) has significantly more solver capability — explicit dynamics, electromagnetics, acoustics, advanced materials, user subroutines. SimScale covers the most common analyses (static, modal, thermal, CFD) but lacks specialized capabilities.

Collaboration

SimScale Collaboration

1. Real-time sharing: Send URL to colleague → instant access
2. No software needed: View results in any browser
3. Public projects: Share with world (portfolio, education)
4. Team management: Roles and permissions
5. Comments: Discuss simulations and results
6. Version history: Track changes
7. API: Automated pipelines

Desktop CAE Collaboration

1. File sharing: Send result files (.rst, .dat) to colleague
2. Software required: Colleague needs same software to view
3. Public sharing: Not built-in (manual upload to website)
4. Team management: License server (FLEXlm) controls access
5. Comments: External (email, Jira, Teams)
6. Version history: Manual (file naming, PDM/PLM)
7. API: Limited (ACT for ANSYS, Python for Abaqus)

Key difference: SimScale is far superior for collaboration — real-time sharing, browser-based viewing, team management, and API automation are built-in. Desktop CAE requires file transfer and matching software installations.

Security

SimScale Security

1. Data center: AWS (ISO 27001, SOC 2 Type II)
2. Encryption: TLS in transit, AES-256 at rest
3. Access control: Role-based (owner, editor, viewer)
4. Multi-tenancy: Isolated project data
5. Compliance: GDPR, SOC 2
6. Data ownership: User owns all data
7. Data deletion: Can delete project and all data

Desktop CAE Security

1. Data location: On-premise (user-controlled)
2. Encryption: Depends on user IT (disk encryption, VPN)
3. Access control: License server + OS permissions
4. Network: Can air-gap (no internet required)
5. Compliance: User-managed (ITAR, EAR, proprietary)
6. Data ownership: Fully on-premise
7. Data deletion: User controls (file deletion)

Key difference: Desktop CAE provides more control over data location (can air-gap for classified work). SimScale provides enterprise-grade cloud security (AWS, ISO 27001) but data is in the cloud. For ITAR or classified work, desktop CAE may be required.

When to Choose SimScale

• You are a small team (1-10 users) without HPC infrastructure
• You need to collaborate with remote team members
• You want to share results with clients (browser-based viewing)
• You run common analyses (static, modal, thermal, CFD)
• You want to avoid IT overhead (no license server, no workstation)
• You need flexible scaling (run many simulations in parallel)
• You are a startup or small company (cost-effective)
• You want to try simulation before investing in desktop tools
• You need API integration for automated pipelines
• You work in academia or education (free community plan)

When to Choose Desktop CAE

• You need explicit dynamics (crash, impact, forming)
• You need advanced CFD (combustion, multiphase, LES)
• You need electromagnetics (Maxwell, HFSS)
• You need user subroutines (UMAT, VUMAT)
• You need 250+ material models
• You work with classified data (ITAR, air-gap required)
• You have an existing HPC cluster (better performance)
• You are a large organization (20+ users, volume licensing)
• You need industry-standard tools (client/regulatory requirement)
• You need GPU acceleration
• You need acoustics or optimization (advanced)

Hybrid Approach

Many organizations use both:

• SimScale: For common analyses (static, thermal, basic CFD), collaboration, and remote work
• Desktop CAE: For advanced analyses (explicit, EM, advanced CFD), classified work, and HPC

This provides:

• Cost-effective common analysis (SimScale)
• Advanced capability when needed (desktop)
• Collaboration for team projects (SimScale)
• Security for sensitive work (desktop)

My Take

After using both SimScale and desktop CAE for a few years, here's what I tell people: if you're a small team doing common analyses (static structural, basic CFD, thermal), SimScale is hard to beat on cost and convenience. If you need explicit dynamics, electromagnetics, or advanced CFD with combustion, you need desktop tools. And if you work with classified data, the cloud isn't an option — you need on-premise. Plenty of companies use both, and that's what I'd recommend if budget allows. SimScale for the everyday stuff, desktop for the heavy lifting.